Synonyms of the word

uncollectible

• adj. That cannot be collected.
• n. (usually in the plural) Something, such as a bad debt, that cannot be collected.

bad

• adj. Not good; unfavorable; negative.
• adj. Not suitable or fitting.
• adj. Seemingly non-appropriate, in manners, etc.
• adj. Unhealthy.
• adj. Tricky; stressful; unpleasant.
• adj. Evil; wicked.
• adj. Faulty; not functional.
• adj. (of food) Spoiled, rotten, overripe.
• adj. (of breath) Malodorous, foul.
• adj. (informal) Bold and daring.
• adj. (hip-hop slang) good, superlative.
• adj. (of a need or want) Severe, urgent.
• adv. (now colloquial) Badly.
• n. (slang) Error, mistake.
• n. (countable, uncountable, economics) An item (or kind of item) of merchandise with negative value; an unwanted…
• adj. (slang) Fantastic.
• v. (archaic) Alternative past tense of bid. See bade.
• v. (Britain, dialect, transitive) To shell (a walnut).

invalid

• adj. Not valid; not true, correct, acceptable or appropriate.
• n. (dated, sometimes offensive) Any person with a disability or illness.
• n. (dated, sometimes offensive) A person who is confined to home or bed because of illness, disability or…
• n. (archaic) A disabled member of the armed forces; one unfit for active duty due to injury.
• adj. Intended for use by an invalid.
• v. (Britain) To exempt from duty because of injury or ill health.