| imperceptibly | (adverb) in an imperceptible manner or to an imperceptible degree | Synonyms: unnoticeably |
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| perceptibly | (adverb) in a noticeable manner | Synonyms: noticeably, observably |
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| perceptively | (adverb) in a perceptive manner | - |
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| perceptually | (adverb) with regard to perception | - |
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| perchance | (adverb) through chance | Synonyms: by chance |
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| (adverb) by chance | Synonyms: maybe, mayhap, peradventure, perhaps, possibly |
| superciliously | (adverb) with a sneer; in an uncomplimentary sneering manner | Synonyms: sneeringly, snidely |
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