ContronymAges 15–20Fast
Moving or happening quickly.
The Shatabdi is a fast train.
Stuck or held firmly; not moving.
The boat was held fast by a strong rope.
Remember: Think 'stand fast' (do not move) versus 'run fast'. Also 'fast asleep' means deeply, firmly asleep.
Short lessonContronymsA few words can mean one thing and also its exact opposite.