characterless vs nondescript

characterless is not a noun while nondescript is a noun.

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

As adjectives, characterless and nondescript are synonyms defined as:

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

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

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