expressed vs uttered

expressed and uttered both are adjectives.

Word	Noun	Adjective	Verb	Adverb
expressed	No	Yes	No	No
uttered	No	Yes	No	No

As adjectives, expressed and uttered are synonyms defined as:

Other synonyms of expressed include verbalised, verbalized, voiced.

expressed (adjective)	uttered (adjective)
precisely and clearly expressed or readily observable; leaving nothing to implication	communicated in words
communicated in words