noun

sharpness of taste; lack of sweetness.

the lime juice imparts a slight bitterness

sharpness,acidity,pungency,acridity,tartness,sourness,harshness,vinegariness,acerbity,resentment,resentfulness,embitteredness,dissatisfaction,disgruntlement,discontent,grudge,pique,indignation,rancour,spite,sullenness,churlishness,moroseness,petulance,peevishness,spleen,acrimony,trauma,pain,painfulness,agony,grief,unpleasantness,disagreeableness,nastiness,awfulness,upset,heartache,heartbreak,unhappiness,misery,wretchedness,sorrow,sadness,distress,desolation,despair,desperation,poignancy,tragedy,intense cold,bitter cold,iciness,frostiness,chilliness,chill,penetration,intensity,bite,nip,sting,keenness,rawness,wintriness,parkiness,hostility,antipathy,antagonism,enmity,animus,friction,virulence,anger,spitefulness,vindictiveness,viciousness,vitriol,savagery,ferocity,hate,hatred,loathing,detestation,venom,poison,bile,ill feeling,ill will,bad blood,malignity,malevolence,choler