thin vs melt off

thin is an adjective but melt off is not an adjective.

Word	Noun	Adjective	Verb	Adverb
thin	No	Yes	Yes	Yes
melt off	No	No	Yes	No

As verbs, thin and melt off are synonyms defined as:

Other synonyms of thin include reduce, slenderize, slim, slim down.

thin (adjective)	melt off (adjective)
of relatively small extent from one surface to the opposite or in cross section
relatively thin in consistency or low in density; not viscous
lacking excess flesh
(of sound) lacking resonance or volume
not dense
very narrow
lacking spirit or sincere effort
lacking substance or significance

thin (verb)	melt off (verb)
take off weight	take off weight
lose thickness; become thin or thinner
make thin or thinner
lessen the strength or flavor of a solution or mixture

thin (adverb)	melt off (adverb)
without viscosity