impending vs impendent

impending and impendent both are adjectives.

Word	Noun	Adjective	Verb	Adverb
impending	No	Yes	No	No
impendent	No	Yes	No	No

As adjectives, impending and impendent are synonyms defined as:

Other synonyms of impending include at hand, close at hand, imminent.

impending (adjective)	impendent (adjective)
close in time; about to occur	close in time; about to occur