indecipherable vs illegible

indecipherable and illegible both are adjectives.

Word	Noun	Adjective	Verb	Adverb
indecipherable	No	Yes	No	No
illegible	No	Yes	No	No

indecipherable (adjective)	illegible (adjective)
not easily deciphered	(of handwriting, print, etc.) not legible
impossible to determine the meaning of