4751  mar  mar

 or (feminine) marah {maw-
raw'}; from 4843; bitter 
(literally or figuratively); 
also (as noun) bitterness, or 
(adverbially) bitterly:--+ 
angry, bitter(-ly, -ness), 
chafed, discontented, X 
great, heavy.

 see HEBREW for 04843