Etymology
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unsparing (adj.)

"showing no mercy," 1580s, from un- (1) "not" + sparing, attested from late 14c. as a present-participle adjective from spare (v.). Meaning "profuse" is from 1660s. Related: Unsparingly.

updated on March 02, 2014

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Definitions of unsparing from WordNet

unsparing (adj.)
very generous;
unsparing generosity
Synonyms: lavish / munificent / overgenerous / too-generous / unstinted / unstinting
unsparing (adj.)
not forbearing; ruthless;
an unsparing critic
From wordnet.princeton.edu, not affiliated with etymonline.