collected vs self-contained

collected and self-contained both are adjectives.

Word	Noun	Adjective	Verb	Adverb
collected	No	Yes	No	No
self-contained	No	Yes	No	No

As adjectives, collected and self-contained are synonyms defined as:

Other synonyms of collected include equanimous, poised, self-collected, self-possessed.

collected (adjective)	self-contained (adjective)
brought together in one place	constituting a complete and independent unit in and of itself
in full control of your faculties	in full control of your faculties