Synonyms of the word

unendurable

• adj. Not to be endured; intolerable.

bitter

• adj. Having an acrid taste (usually from a basic substance).
• adj. Harsh, piercing or stinging.
• adj. Hateful or hostile.
• adj. Cynical and resentful.
• n. (usually in the plural bitters) A liquid or powder, made from bitter herbs, used in mixed drinks or as…
• n. A type of beer heavily flavored with hops.
• n. (nautical) A turn of a cable about the bitts.
• v. To make bitter.
• n. (computing, informal, in combination) A hardware system whose architecture is based around units of the…

impermissible

• adj. Not permissible; not to be permitted or allowed.

impossible

• adj. Not possible; not able to be done or happen.
• adj. (colloquial, of a person) Very difficult to deal with.
• adj. (mathematics, dated) imaginary.
• n. (obsolete) an impossibility.

insufferable

• adj. Not sufferable; very difficult or impossible to endure.

intolerable

• adj. Not tolerable; not capable of being borne or endured; not proper or right to be allowed; insufferable;…
• adj. Extremely offensive or insulting.

unacceptable

• adj. unsatisfactory; not acceptable.
• adj. (linguistics) not conforming to accepted usage.
• n. Something that is not acceptable.

unbearable

• adj. so unpleasant or painful as to be unendurable.

unsufferable

• adj. Not able to be suffered, difficult or impossible to endure; insufferable.

unsupportable

• adj. Not able to be supported or endured.