a.
1.
Sour, acid, acidulous, sharp.
2.
Severe, harsh, caustic, crabbed, sharp snappish, testy, snarling, petulant, acrimonious, ill-tempered, ill-humored, keen.
TART
Meaning of TART in English
Soule. Dictionary of English synonyms. Словарь английских синонимов. 2012