instant
Adjective[C/U] Both
pl: instants
This word conveys a sense of abruptness and zero delay. It is often used to emphasize a sudden shift in state or a reaction that occurs without any conscious processing time, creating a feeling of sharpness or a spark.
Countable when referring to a specific, fleeting moment in time. Uncountable when describing the general quality of immediacy, such as in instant coffee.