FROM STRONG’S HEBREW DICTIONARY (1890)

Strong’s Hebrew Dictionary (1890) — public domain, printed whole.

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