unvoiced vs voiceless

unvoiced and voiceless both are adjectives.

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

As adjectives, unvoiced and voiceless are synonyms defined as:

Other synonyms of unvoiced include hard, surd.

unvoiced (adjective)	voiceless (adjective)
produced without vibration of the vocal cords	deprived of the rights of citizenship especially the right to vote
not made explicit	produced without vibration of the vocal cords
	being without sound through injury or illness and thus incapable of all but whispered speech
	uttered without voice