1. immediately, instantly, straightaway, straight off, directly, now, right away, at once, forthwith, like a shot

usage: 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. promptly, right away

usage: at once (usually modifies an undesirable occurrence); "he promptly forgot the address"

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