noun

rancour

rancor, bitterness, resentment

He spoke without any rancour.

He spoke without any rancor.

There was a great deal of rancour between them.

There was a great deal of rancor between them.

((between sb.)) rancor between people There was rancor between the two families.

Synonyms: bitterness, resentment, malice; Antonyms: goodwill, friendliness

From Old French 'rancor' (bitterness), from Latin 'rancorem' (rankness, bitterness). Note the '-our' spelling in British English vs. '-or' in American English.

Imagine someone holding a grudge for so long it has become 'rank' or spoiled, like rancid butter. That deep-seated bitterness is rancor.

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