extraneous vs impertinent

extraneous and impertinent both are adjectives.

Word	Noun	Adjective	Verb	Adverb
extraneous	No	Yes	No	No
impertinent	No	Yes	No	No

As adjectives, extraneous and impertinent are synonyms defined as:

extraneous and impertinent: not pertinent to the matter under consideration

Other synonyms of extraneous include immaterial, orthogonal.

extraneous (adjective)	impertinent (adjective)
not belonging to that in which it is contained; introduced from an outside source	improperly forward or bold
not pertinent to the matter under consideration	not pertinent to the matter under consideration
coming from the outside	characterized by a lightly pert and exuberant quality
not essential