B2adjectiveformal3K

Unacceptable

UK /["/ˌʌnəkˈseptəbl/"]/US /["/ˌʌnəkˈseptəbl/"]/

Definition

so bad that you think it should not be allowed

In simple words: Not okay or not allowed.

Examples

Such behaviour is totally unacceptable in a civilized society.
Noise from the factory has reached an unacceptable level.
Most people would consider such risks wholly unacceptable.
Such a solution would be quite unacceptable to the majority of people.
The cost of these proposed changes makes them unacceptable.
There is nothing inherently unacceptable in these proposals.
Raising taxes now would be politically unacceptable.

Usage notes

Use 'unacceptable' in formal situations, such as professional settings or written complaints. Avoid in casual conversations.

Grammar pattern

standalone adjective

Memory hint

Think of 'un' as 'not' and 'acceptable' as 'okay' — so it means 'not okay'.

Collocations

be
prove
seem
absolutely
completely
entirely
to

Synonyms

intolerable
inappropriate
unallowable
unsuitable

Antonyms

acceptable
agreeable
satisfactory

Common mistakes

Confused with 'unacceptable' and 'unexceptable'.
Used in casual contexts where simpler words like 'not okay' would fit better.
Mispronounced, especially the 'un' part.