unsatisfactory; not acceptable / (linguistics) not conforming to accepted usage

Something that is not acceptable.

plural of unacceptable

Unacceptability.

Third-person singular simple present indicative form of unaccept

Not accepted; unacceptable.

simple past tense and past participle of unaccept

The property of being unacceptable.

Not within the limits of what is generally considered to be acceptable.

A lack of acceptance; the condition of not accepting something