The guests were offended by his uncouth manners.

A. wasteful

B. dirty

C. undesirable

D. ungracious

Answer: Option D

Solution(By Examveda Team)

Wasteful : (of a person, action, or process) using or expending something of value carelessly, extravagantly, or to no purpose.
Dirty : covered or marked with an unclean substance.
Undesirable : not wanted or desirable because harmful, objectionable, or unpleasant.
Ungracious : not polite or friendly.
Uncouth : lacking good manners, refinement, or grace.

Synonym of Uncouth is Ungracious