Found can be a past tense of the verb "to find" or a verb meaning to establish or begin, or an adjective.
The antonym for found (discovered, recovered, gained) is lost. (also misplaced).
The antonyms for found (to establish or inaugurate) would be to end, conclude, terminate, disband, or disestablish.
they are usually found in 7THgrade reading
Synonyms and antonyms can be found in a thesaurus. (A more limited number can be found in a dictionary.)
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what isbrief of antonyms
What are the antonyms for cavernous
antonyms
Curtailment means "to cut short or reduce" (taken from thefreedictionary dot com). Surprisingly, no thesaurus has any antonyms for curtailment, though it is plausible that one could be found somewhere.
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antonyms for slender
antonyms for said