thin vs sparse

thin and sparse both are adjectives.

Word	Noun	Adjective	Verb	Adverb
thin	No	Yes	Yes	Yes
sparse	No	Yes	No	No

As adjectives, thin and sparse are synonyms defined as:

thin (adjective)	sparse (adjective)
of relatively small extent from one surface to the opposite or in cross section	not dense
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)	sparse (verb)
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)	sparse (adverb)
without viscosity