Bitterness (noun) — مرارة: The sharp unsweet quality itself — a taste, a residue of hurt, or the honest sting you can name and measure Below are 8 words with a similar meaning; the linked ones have full GL Dictionary entries with their meaning in Arabic.
acridityharshnessresentmentastringencygallrancorpungencysoreness
Bitter sharpness in speech or feeling — harsh ill will that makes discussion sharp and hostile
A feeling of resentful longing aroused by someone else's possessions, qualities, or luck; the emotion of coveting others' advantages.
A persistent feeling of ill will over a past wrong.
Unfriendly or aggressive feeling or behaviour.
A feeling of resentful envy of someone's success or advantages.