Thesaurus

ail

verb

Synonyms and Antonyms of AIL

to trouble the mind of; to make uneasy <parents who were at a loss to explain what was ailing their normally vivacious daughter>
Antonyms calm, compose, quiet, settle, soothe, tranquilize (also tranquillize)

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How to use a word that (literally) drives some people nuts.
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Ailurophobia, and 9 other unusual fears