instantaneous Synonyms

instant harefooted swift summary sudden spontaneous speedy snappy short-lived rootless ready rapid quick prompt swifter temporary gone in flash unanticipated snapshot real time on the spot move it lead out reflexiveness unlooked-for unlooked unexpected transitory transient present precipitous precipitate fading express expeditious evanescent ephemeral direct curtate curtal cursory brisk brief breakneck FAST fleeting fleet passing momentary momentaneous