Antonyms of adj knackered

1 sense of knackered

Sense 1
knackered, drained -- (very tired)

INDIRECT (VIA tired) -> rested -- (not tired; refreshed as by sleeping or relaxing; "came back rested from her vacation")

Similarity of adj knackered

1 sense of knackered

Sense 1
knackered, drained -- (very tired)
       => tired (vs. rested) -- (depleted of strength or energy; "tired mothers with crying babies"; "too tired to eat")