Synonyms of the word

effectual

• adj. Producing the intended result; entirely adequate.

effective

• adj. Having the power to produce a required effect or effects.
• adj. Producing a decided or decisive effect.
• adj. Efficient, serviceable, or operative, available for useful work.
• adj. Actually in effect.
• adj. (geometry, of a cycle or divisor) Having no negative coefficients.
• n. (military) A soldier fit for duty.

efficacious

• adj. Effective; possessing efficacy.

efficient

• adj. Making good, thorough, or careful use of resources; not consuming extra. Especially, making good use of…
• adj. Expressing the proportion of consumed energy that was successfully used in a process; the ratio of useful…
• adj. Causing effects, producing results; bringing into being; initiating change. (Rare except in philosophical…
• adj. (proscribed, old use) Effective.

hard-hitting

• adj. Aggressively vigorous or forceful.

impelling

• v. present participle of impel.

impressive

• adj. Making, or tending to make, a positive impression; having power to impress.
• adj. Capable of being impressed.
• adj. Appealing.

legal

• adj. Relating to the law or to lawyers.
• adj. Having its basis in the law.
• adj. Being allowed or prescribed by law.
• adj. (informal) Above the age of consent or the legal drinking age.
• n. (uncountable, informal) The legal department of a company.
• n. (uncountable, US, Canada) Paper in sheets 8½ in × 14 in (215.9 mm × 355.6 mm).
• n. (countable) A spy who is attached to, and ostensibly employed by, an embassy, military outpost, etc.

potent

• adj. Possessing strength.
• adj. Being effective, causing body effects.
• adj. Having a sharp or offensive taste.
• adj. (of a male) Able to procreate.
• adj. Very powerful or effective.
• n. (heraldry) A heraldic fur formed by a regular tessellation of blue and white T shapes.
• n. (obsolete) A prince; a potentate.
• n. (obsolete) A staff or crutch.

powerful

• adj. Having, or capable of exerting power, potency or influence.
• adj. (mining) Large; capacious; said of veins of ore.

rough-and-ready

• adj. Alternative form of rough and ready.

sound

• adj. Healthy.
• adj. Complete, solid, or secure.
• adj. (mathematics, logic) Having the property of soundness.
• adj. (Britain, slang) Good; acceptable; decent.
• adj. (of sleep) Quiet and deep. Sound asleep means sleeping peacefully, often deeply.
• adj. Heavy; laid on with force.
• adj. Founded in law; legal; valid; not defective.
• adv. Soundly.
• interj. (Britain, slang) Yes; used to show agreement or understanding, generally without much enthusiasm.
• n. A sensation perceived by the ear caused by the vibration of air or some other medium.
• n. A vibration capable of causing such sensations.
• n. (music) A distinctive style and sonority of a particular musician, orchestra etc.
• n. Noise without meaning; empty noise.
• v. (intransitive) To produce a sound.
• v. (copulative) To convey an impression by one's sound.
• v. (intransitive) To be conveyed in sound; to be spread or published; to convey intelligence by sound.
• v. (intransitive, obsolete) To resound.
• v. (intransitive, law, often with in) To arise or to be recognizable as arising in or from a particular area…
• v. (transitive) To cause to produce a sound.
• v. (transitive, phonetics, of a vowel or consonant) To pronounce.
• n. (geography) A long narrow inlet, or a strait between the mainland and an island; also, a strait connecting…
• n. The air bladder of a fish.
• n. A cuttlefish.
• v. (intransitive) Dive downwards, used of a whale.
• v. To ascertain, or try to ascertain, the thoughts, motives, and purposes of (a person); to examine; to try;…
• v. Test; ascertain the depth of water with a sounding line or other device.
• v. (medicine) To examine with the instrument called a sound or sonde, or by auscultation or percussion.
• n. (medicine) An instrument for probing or dilating; a sonde.
• n. A long, thin probe for sounding body cavities or canals such as the urethra.

stiff

• adj. (of an object) Rigid, hard to bend, inflexible.
• adj. (figuratively, of policies and rules and their application and enforcement) Inflexible; rigid.
• adj. (of a person) Formal in behavior; unrelaxed.
• adj. (colloquial) Harsh, severe.
• adj. (of muscles or parts of the body) Painful as a result of excessive or unaccustomed exercise.
• adj. Potent.
• adj. Dead, deceased.
• adj. (of a penis) Erect.
• adj. (cooking, of whipping cream or egg whites) Beaten until so aerated that they stand up straight on their…
• adj. (mathematics) Of an equation: for which certain numerical solving methods are numerically unstable, unless…
• n. An average person, usually male, of no particular distinction, skill, or education, often a working stiff…
• n. A person who is deceived, as a mark or pigeon in a swindle.
• n. (slang) A cadaver, a dead person.
• n. (US) A person who leaves (especially a restaurant) without paying the bill.
• n. (blackjack) Any hard hand where it is possible to exceed 21 by drawing an additional card.
• v. To fail to pay that which one owes (implicitly or explicitly) to another, especially by departing hastily.
• v. to cheat someone.
• v. to tip ungenerously.

strong

• adj. Capable of producing great physical force.
• adj. Capable of withstanding great physical force.
• adj. (of water, wind, etc.) Having a lot of power.
• adj. Determined; unyielding.
• adj. Highly stimulating to the senses.
• adj. Having an offensive or intense odor or flavor.
• adj. Having a high concentration of an essential or active ingredient.
• adj. (specifically) Having a high alcoholic content.
• adj. (grammar) Inflecting in a different manner than the one called weak, such as Germanic verbs which change…
• adj. (chemistry) That completely ionizes into anions and cations in a solution.
• adj. (military) Not easily subdued or taken.
• adj. (slang, US) Impressive, good.
• adj. Having a specified number of people or units.
• adj. (of a disease or symptom) severe (very bad or intense).
• adj. (mathematics, logic) Having a wide range of logical consequences; widely applicable. (Often contrasted…
• adj. (of an argument) Convincing.
• adv. In a strong manner.

telling

• adj. having force.
• adj. revealing information.
• adj. serving to convince.
• v. present participle of tell.
• n. The act of narration.
• n. The disclosure of information.
• n. (archaic) Counting, numbering.

trenchant

• adj. (obsolete) Fitted to trench or cut; gutting; sharp.
• adj. (figuratively) Keen; biting; vigorously effective and articulate; severe.

useful

• adj. Having a practical or beneficial use.

utile

• adj. (now rare) Useful.
• n. (economics) A theoretical unit of measure of utility, for indicating a supposed quantity of satisfaction…

valid

• adj. Well grounded or justifiable, pertinent.
• adj. Acceptable, proper or correct.
• adj. Related to the current topic, or presented within context, relevant.
• adj. (logic) Of a formula or system: such that it evaluates to true regardless of the input values.
• adj. (logic) Of an argument: whose conclusion is always true whenever its premises are true.