unpleasant-smelling vs malodorous

unpleasant-smelling and malodorous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unpleasant-smelling	No	Yes	No	No
malodorous	No	Yes	No	No

As adjectives, unpleasant-smelling and malodorous are synonyms defined as:

Other synonyms of unpleasant-smelling include ill-smelling, malodourous, stinky.

unpleasant-smelling (adjective)	malodorous (adjective)
having an unpleasant smell	having an unpleasant smell