inadequate vs understaffed

inadequate and understaffed both are adjectives.

Word	Noun	Adjective	Verb	Adverb
inadequate	No	Yes	No	No
understaffed	No	Yes	No	No

inadequate (adjective)	understaffed (adjective)
lacking the requisite qualities or resources to meet a task	inadequate in number of workers or assistants etc.
of insufficient quantity to meet a need