bitter

n.

[1]	bitterness
[2]	bitterness

adv.

[1]	piercingly , bitterly , bitingly

adj.

[1]	harsh , acerbic , acrid , sharp , caustic , mordant
[2]	unappetizing , distasteful , unsavoury , unpleasant , hard (to swallow/take) , irritating , obnoxious , disagreeable , nasty , painful , unwelcome , unpalatable
[3]	miserable , grievous , dispiriting , distressing , cruel , distressful
[4]	resentful , embittered , rancorous , hateful
[5]	stinging , cutting , biting , harsh , reproachful , vicious , acrimonious , virulent , cruel , unkind , unpleasant , nasty
[6]	sharp , keen , cutting , severe , biting , cold , wintry , freezing
[7]	acerb , acid , blistering , sulfurous , sulphurous , vitriolic