If referring to movement through the air:
* Landed: This is the most direct opposite, as it signifies the opposite action of flying.
* Grounded: This implies a state of being on the ground, the opposite of being airborne.
* Crawled: This emphasizes a slow, ground-based movement, contrasting with the speed and agility of flying.
If referring to the past tense of "fly" in the sense of traveling by air:
* Driven: This implies travel by land, contrasting with travel by air.
* Sailed: This implies travel by water, contrasting with travel by air.
* Walked: This implies a simple, straightforward way of traveling, contrasting with the more complex and fast-paced method of flying.
If referring to the past tense of "fly" in the sense of time passing quickly:
* Dragged: This suggests time passing slowly, the opposite of time "flying" by.
* Stalled: This implies a pause or delay, contrasting with the rapid movement implied by "flown."
Ultimately, the best antonym for "flown" depends on the specific meaning and context of the word in your sentence.