even-tempered vs placid

even-tempered and placid both are adjectives.

Word	Noun	Adjective	Verb	Adverb
even-tempered	No	Yes	No	No
placid	No	Yes	No	No

As adjectives, even-tempered and placid are synonyms defined as:

Other synonyms of even-tempered include equable, good-tempered.

even-tempered (adjective)	placid (adjective)
not easily irritated	(of a body of water) free from disturbance by heavy waves
	not easily irritated