"instantly" in the adverb sense
1. immediately, instantly, straightaway, straight off, directly, now, right away, at once, forthwith, like a shot
without delay or hesitation with no time intervening
"he answered immediately"
"found an answer straightaway"
"an official accused of dishonesty should be suspended forthwith"
"Come here now!"
2. instantaneously, outright, instantly, in a flash
without any delay
"he was killed outright"
Source: WordNet® (An amazing lexical database of English)
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