Synonyms for bitter

Some common synonyms of bitter are: bitter [a.] 1. Acrid, tasting like wormwood, like gall. 2. Fierce, savage, cruel, merciless, relentless, virulent, fell, ruthless, dire. 3. Severe, harsh, stern. 4. Distressing, painful, grievous, intense, sore, sorrowful, afflictive, poignant, calamitous.