the.com/unkindness

Also the official name for a group of ravens, which feels accurate.

means The quality of being unkind — a lack of kindness or an act of cruelty, however small.

from Formed straightforwardly in Middle English from 'unkind' plus the noun suffix '-ness.' 'Kind' itself once meant 'natural' or 'of the same family' (related to 'kin'), so to be 'unkind' originally carried a whiff of acting against nature or against one's own people, before it settled into simply meaning cruel or unfeeling. The 'unkindness of ravens' is a separate thread: one of the fanciful collective nouns — like a 'murder of crows' — recorded in 15th-century hunting and courtesy books, where writers delighted in inventing dramatic group names for animals. Whether it reflects real observation of raven behavior or just medieval wordplay is genuinely unclear, but the phrase stuck.

collective noun
flock of ravens is called an unkindness
first recorded
15th-century hunting terms loved dramatic flair
actual meaning
cruelty without the effort of malice
opposite word
kindness, obviously, but less fun to say
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