Instantaneous

1.

(immediate, happening or following in an instant) ដែលកើតឡើងភ្លាម, ឋិតនៅតែមួយភ្លែត, ដែលរហ័សណាស់
Example: Death was instantaneous, If in a fatal accident.

1.

Done or occurring in an instant, or without any perceptible duration of time; as, the passage of electricity appears to be instantaneous.

2.

At or during a given instant; as, instantaneous acceleration, velocity, etc.

1.

abrupt hasty, immediate, rapid, sudden, unexpected

1.

anticipated, gradual, slowly