Synonyms for instant

immediate, prompt, instantaneous, on-the-spot, ready-to-use, ready-to-eat, ready-to-serve, premixed, precooked; see also immediate 1, prepared 2, 3.

moment, second, short while, flash, trice, split second, twinkling, wink of an eye, jiffy*, shake*, two shakes of a lamb's tail*, jiff*, sec*; see also moment 1.

instantly, without delay, simultaneously; see immediately.