| macroscopically | (adverb) without using a microscope | - |
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| madly | (adverb) (used as intensives) excessively | Synonyms: deadly, deucedly, devilishly, insanely |
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| (adverb) in an insane manner | Synonyms: crazily, dementedly, insanely |
| (adverb) in an ungovernable manner | Synonyms: frantically |
| magically | (adverb) in a magical manner | Synonyms: as if by magic |
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| magisterially | (adverb) in an authoritative and magisterial manner | Synonyms: authoritatively |
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| (adverb) in an overbearingly domineering manner; as a dictator | Synonyms: autocratically, dictatorially |
| magnanimously | (adverb) in a magnanimous manner | - |
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| magnetically | (adverb) as if by magnetism | - |
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| (adverb) by the use of magnetism | - |
| magnificently | (adverb) wonderfully | Synonyms: excellently, famously, splendidly |
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| (adverb) in an impressively beautiful manner | Synonyms: gorgeously, resplendently, splendidly |
| magniloquently | (adverb) in a rhetorically grandiloquent manner | Synonyms: grandiloquently |
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| mainly | (adverb) for the most part | Synonyms: chiefly, in the main, primarily, principally |
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| majestically | (adverb) in a majestic manner | - |
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| maladroitly | (adverb) in a maladroit manner | - |
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| malapropos | (adverb) at an inconvenient time | Synonyms: inopportunely |
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| malevolently | (adverb) in a malevolent manner | - |
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| maliciously | (adverb) with malice; in a malicious manner | - |
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| malignantly | (adverb) in a malignant manner, as of a tumor that spreads | - |
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| malignly | (adverb) in a malign and evil manner | - |
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| manageably | (adverb) so as to be manageable | - |
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| managerially | (adverb) in a managerial manner | - |
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| mandatorily | (adverb) in a manner that cannot be evaded | Synonyms: compulsorily, obligatorily |
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| manfully | (adverb) in a manful manner; with qualities thought to befit a man | Synonyms: manly |
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| mangily | (adverb) in a mangy manner | - |
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| maniacally | (adverb) in a maniacal manner or to a maniacal degree | - |
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| manifestly | (adverb) unmistakably (`plain' is often used informally for `plainly') | Synonyms: apparently, evidently, obviously, patently, plain, plainly |
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| manipulatively | (adverb) in an artfully manipulative manner | - |
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| manly | (adverb) in a manful manner; with qualities thought to befit a man | Synonyms: manfully |
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| manually | (adverb) by hand | - |
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| marginally | (adverb) in a marginal manner | - |
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| markedly | (adverb) in a clearly noticeable manner | - |
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| martially | (adverb) in a martial manner | - |
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| marvellously | (adverb) (used as an intensifier) excellently | Synonyms: marvelously, superbly, terrifically, toppingly, wonderfully, wondrous, wondrously |
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| marvelously | (adverb) (used as an intensifier) excellently | Synonyms: marvellously, superbly, terrifically, toppingly, wonderfully, wondrous, wondrously |
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| masochistically | (adverb) in a masochistic manner | - |
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| massively | (adverb) to a massive degree or in a massive manner | - |
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| masterfully | (adverb) in a skillfully masterful manner; with the skill of a master | - |
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| materialistically | (adverb) in a materialistic manner | - |
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| materially | (adverb) with respect to material aspects | - |
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| (adverb) to a significant degree | - |
| maternally | (adverb) in a maternal manner; as a mother | Synonyms: motherly |
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| mathematically | (adverb) with respect to mathematics | - |
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| matrilineally | (adverb) by descent through the female line | - |
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| maturely | (adverb) in a mature manner | - |
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| mawkishly | (adverb) in a mawkish and emotional manner | Synonyms: drippily |
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| maximally | (adverb) to a maximal degree | - |
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| maybe | (adverb) by chance | Synonyms: mayhap, peradventure, perchance, perhaps, possibly |
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| mayhap | (adverb) by chance | Synonyms: maybe, peradventure, perchance, perhaps, possibly |
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