Ranked by relevance and common usage.
Keep "nonkindness" when the sentence already sounds natural, when a synonym would add unintended emphasis, or when readers need the most familiar wording. A synonym should clarify or sharpen the message, not simply make the sentence look more varied.
If two options seem close, choose the one that best matches the audience and purpose of the sentence.
Choose a synonym only if it keeps the core idea of "nonkindness" intact in the sentence you are editing.
Check whether the replacement sounds more formal, casual, emotional, technical, or forceful than the original word.
Read the full sentence after the swap. Keep the synonym only when the sentence becomes clearer or more precise.
Review note: Synonym lists are ranked with lexical data and reviewed for practical writing value. Use the comparison notes, sentence evidence, and source labels together; a high-ranking synonym can still be wrong when the audience, register, or grammar changes.
After choosing a replacement for "nonkindness", read the sentence once for meaning and once for rhythm. The best synonym should feel natural in the full sentence, not only accurate in a word list.
If the synonym makes the sentence slower, vaguer, or more dramatic than intended, keep "nonkindness" or choose a simpler alternative from the closest-match group.
3 total sentences available.
That this is true needs no words of science to verify, for those who have been through such experience and know the awful sinking of bodily energies which follows lasting grief, not so much the pain of bereavement as of daily harshness, crossing and unkindness—or nonkindness—the mere lack of affection.
Source: wiktionary
If the person smiled, certain traits such as humor, honesty, and kindness were mentioned in the Ss’ characterizations, but, if the person did not smile, then the traits that were mentioned were high in dishonesty, nonkindness, and impersonality.
Source: wiktionary
But he heard the words [Ronald] Reagan said when he made a speech standing just a few yards from the Berlin Wall, which had come to symbolize for the world the nonfreedom and nonkindness of communism:[…]
Source: wiktionary
Closest matches include unkindness.
Compare the replacement against real sentence context. This entry includes sample sentences so you can check tone, grammar, and meaning before swapping words.