unvoiced vs unexpressed

unvoiced and unexpressed both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unvoiced	No	Yes	No	No
unexpressed	No	Yes	No	No

As adjectives, unvoiced and unexpressed are synonyms defined as:

Other synonyms of unvoiced include unsaid, unspoken, unstated, unuttered, unverbalised, unverbalized.

unvoiced (adjective)	unexpressed (adjective)
produced without vibration of the vocal cords	not made explicit
not made explicit