insists upon (verb) challenge: dispute, question
Sinonime: acerbic, acid, angry, astringent,
belligerent,
biting,
bitter,
caustic, censorious,
churlish, crabby, cranky, cross,
cutting,
indignant,
irascible,
irate, ireful,
mad, mordant, peevish, petulant, rancorous,
sarcastic,
sharp,
spiteful, splenetic,
tart, testy,
trenchant, wrathful
Antonime: kind,
kindly, peaceable