Collocations for unacceptable - adj.

be, prove, seem
become
remain
make sth
The cost of these proposed changes makes them unacceptable.

consider sth, deem sth, find sth, regard sth as, see sth as
Most people would consider such risks wholly unacceptable.

absolutely, completely, entirely, just, quite, simply, totally, utterly, wholly
clearly
morally, politically, socially
socially unacceptable conduct

to
Such a solution would be quite unacceptable to the majority of people.

Unacceptable is used with these nouns:
behaviour, degree, face, level, risk