unexpressed vs unvoiced

unexpressed and unvoiced both are adjectives.

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

As adjectives, unexpressed and unvoiced are synonyms defined as:

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

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