Unmannerly
Part of speech: adverb
Definition: In a way that is not mannerly.
Bad-mannered
Part of speech: adjective
Definition: Of or pertaining to having bad manners; impolite.
Unmannerly as an adverb is in a way that is not mannerly. while Bad-mannered as an adjective is of or pertaining to having bad manners; impolite.
Part of speech: adverb
Definition: In a way that is not mannerly.
Part of speech: adjective
Definition: Of or pertaining to having bad manners; impolite.
We hope you now know whether to use Unmannerly or Bad-mannered in your sentence.