Unmannered is a related term of unpretentious.
As adjectives the difference between unmannered and unpretentious
is that unmannered is having poor manners or social skills; ill-mannered; rude while unpretentious is simple, humble, not pretentious, plain.
unpretentious
English
Adjective
(
en adjective)
Simple, humble, not pretentious, plain.
Synonyms
* See
Antonyms
* pretentious
Derived terms
* unpretentiously
* unpretentiousness