| frequent | (adjective) coming at short intervals or habitually | - |
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| (adjective) frequently encountered | - |
| infrequent | (adjective) not frequent; not occurring regularly or at short intervals | - |
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| prerequisite | (adjective) required as a prior condition or course of study | - |
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| requested | (adjective) asked for | - |
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| required | (adjective) necessary for relief or supply | Synonyms: needed, needful, requisite |
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| (adjective) required by rule | Synonyms: compulsory, mandatory |
| requisite | (adjective) necessary for relief or supply | Synonyms: needed, needful, required |
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| unfrequented | (adjective) devoid of creatures | Synonyms: lonely, solitary |
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| unrequested | (adjective) not requested | - |
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| unrequited | (adjective) not returned in kind | Synonyms: unanswered, unreciprocated |
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