impecunious vs penniless

impecunious and penniless both are adjectives.

Word	Noun	Adjective	Verb	Adverb
impecunious	No	Yes	No	No
penniless	No	Yes	No	No

As adjectives, impecunious and penniless are synonyms defined as:

impecunious and penniless: not having enough money to pay for necessities

Other synonyms of impecunious include hard up, in straitened circumstances, penurious, pinched.

impecunious (adjective)	penniless (adjective)
not having enough money to pay for necessities	not having enough money to pay for necessities