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querulous (adj.)

"habitually complaining; expressing complaint," c. 1400, querelous, from Old French querelos "quarrelsome, argumentative" and directly from Late Latin querulosus, from Latin querulus "full of complaints, complaining," from queri "to complain," from Proto-Italic *kwese-, of uncertain etymology, perhaps, via the notion of "to sigh," from a PIE root *kues- "to hiss" (source also of Sanskrit svasiti "to hiss, snort"), which is not very compelling, but no better etymology has been offered.

It retains the original vowel of quarrel (n.1). Related: Querulously; querulousness.

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Definitions of querulous from WordNet

querulous (adj.)
habitually complaining;
Synonyms: fretful / whiney / whiny
From wordnet.princeton.edu