| ill | (adverb) (`ill' is often used as a combining form) in a poor or improper or unsatisfactory manner; not well | Synonyms: badly, poorly |
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| (adverb) with difficulty or inconvenience; scarcely or hardly | - |
| (adverb) unfavorably or with disapproval | Synonyms: badly |
| illegally | (adverb) in an illegal manner | Synonyms: illicitly, lawlessly |
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| illegibly | (adverb) in an illegible manner | Synonyms: undecipherably, unreadably |
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| illegitimately | (adverb) of biological parents not married to each other | Synonyms: out of wedlock |
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| (adverb) in a manner disapproved or not allowed by custom | Synonyms: illicitly |
| illiberally | (adverb) in a manner that isn't broad-minded | Synonyms: intolerantly |
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| illicitly | (adverb) in a manner disapproved or not allowed by custom | Synonyms: illegitimately |
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| (adverb) in an illegal manner | Synonyms: illegally, lawlessly |
| illogically | (adverb) in an illogical manner | - |
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| illustriously | (adverb) in an illustrious manner | - |
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