pent-up resentment; grudges and hard feelings
Often used in the set phrase 恨みつらみ (resentment and bitterness). Refers to deep-seated, lingering ill will.
See also: 恨みつらみ
He poured out all his pent-up resentment and bitterness.
長年のつらみが爆発した。
Years of pent-up resentment exploded.
Derived from the adjective つらい (painful, bitter). The exact historical derivation is uncertain, but it functions as a noun meaning 'bitter feelings'.