nondescript vs characterless

nondescript is a noun but characterless is not a noun.

Word	Noun	Adjective	Verb	Adverb
nondescript	Yes	Yes	No	No
characterless	No	Yes	No	No

As adjectives, nondescript and characterless are synonyms defined as:

nondescript and characterless: lacking distinct or individual characteristics; dull and uninteresting

nondescript (noun)	characterless (noun)
a person who is not easily classified and not very interesting

nondescript (adjective)	characterless (adjective)
lacking distinct or individual characteristics; dull and uninteresting	lacking distinct or individual characteristics; dull and uninteresting