Synonyms of the word

efficacious

• adj. Effective; possessing efficacy.

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.

effectual

• adj. Producing the intended result; entirely adequate.

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.

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.

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…