fast asleep
Out like light
Fast asleep means deeply or soundly asleep—not lightly dozing but fully unconscious.
Here fast preserves an older sense meaning firmly or securely, as in holding fast.
The children were fast asleep by nine.
I was fast asleep when the phone rang.
- dead to the worldDeeply, unrousably asleep
- out like a lightSuddenly and completely unconscious
- conked outCeased to function suddenly
- slumberLight, restful unconsciousness
- comatoseDeeply unconscious, unrousable
out cold · snoozing · catching some z's · rest · down for the count · out for the count · crashed · knocked out · reposing · sawing logs · dreaming · passed out · forty winks · snoring · bed · tucked in · hitting the hay · zonked
- asleepsnoring, sawing logs, catching zs, out like a light, zonked
- sleepnap, doze, slumber, naps, snooze
- intensifiersvery, really, extremely, absolutely, incredibly