| biennially | (adverb) every two years | Synonyms: biyearly |
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| centennially | (adverb) every hundred years; once in a century | - |
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| ceremonially | (adverb) in a ceremonial manner | Synonyms: ritually |
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| (adverb) in a ceremonious manner | Synonyms: ceremoniously |
| congenially | (adverb) in a congenial manner | - |
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| demoniacally | (adverb) in a very agitated manner; as if possessed by an evil spirit | Synonyms: frenetically |
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| genially | (adverb) in an affable manner | Synonyms: affably, amiably |
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| maniacally | (adverb) in a maniacal manner or to a maniacal degree | - |
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| menially | (adverb) in a menial manner | - |
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| perennially | (adverb) in a perennial manner; repeatedly | - |
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| undeniably | (adverb) to an undeniable degree or in an undeniable manner | - |
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