Extended Strong's Greek Lexicon (Abbott-Smith based)
bitter
Usage: πικρός, -ά, -όν (poët. in cl.), [in LXX chiefly for מַר ;] __1. sharp, pointed. __2. sharp to the senses; of taste, bitter: opposite to γλυκύ, Jas.3:11; metaphorically, harsh, bitter: Jas.3:14 (AS)