stirred vs stirred up

stirred and stirred up both are adjectives.

Word	Noun	Adjective	Verb	Adverb
stirred	No	Yes	No	No
stirred up	No	Yes	No	No

As adjectives, stirred and stirred up are synonyms defined as:

Other synonyms of stirred include aroused, stimulated.

stirred (adjective)	stirred up (adjective)
being excited or provoked to the expression of an emotion	emotionally aroused
set into a usually circular motion in order to mix or blend
emotionally aroused