| instantaneously | (adverb) without any delay | Synonyms: in a flash, instantly, outright |
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| instantly | (adverb) without delay or hesitation; with no time intervening | Synonyms: at once, directly, forthwith, immediately, like a shot, now, right away, straight off, straightaway |
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| (adverb) without any delay | Synonyms: in a flash, instantaneously, outright |
| instead | (adverb) in place of, or as an alternative to | Synonyms: alternatively, or else |
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| (adverb) on the contrary | Synonyms: rather |
| instinctively | (adverb) as a matter of instinct | - |
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| institutionally | (adverb) by an institution | - |
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| instructively | (adverb) in an informative manner | Synonyms: informatively |
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