unsparing vs overgenerous

unsparing and overgenerous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unsparing	No	Yes	No	No
overgenerous	No	Yes	No	No

As adjectives, unsparing and overgenerous are synonyms defined as:

Other synonyms of unsparing include lavish, munificent, too-generous, unstinted, unstinting.

unsparing (adjective)	overgenerous (adjective)
very generous	very generous
not forbearing; ruthless