If "darted" means "moved quickly and suddenly":
* Ambled: Moved slowly and leisurely
* Strolled: Walked slowly and casually
* Sauntered: Walked with a relaxed and unhurried gait
* Proceeded: Moved forward in a steady and deliberate way
* Crawled: Moved slowly and on all fours
If "darted" means "threw or shot something quickly":
* Launched: Threw something with force and intention
* Hurl: Threw something with great force
* Fired: Shot a projectile from a weapon
* Released: Let go of something that was held
If "darted" means "looked quickly":
* Glanced: Looked briefly
* Stared: Looked for a long time
* Gazed: Looked intently
* Examined: Looked at something carefully
If "darted" means "moved in and out of sight quickly":
* Remained: Stayed in place
* Hovered: Stayed in one place in the air
* Dwelt: Lived or stayed in a place for a long time
* Endured: Continued to exist or remain in a place
The best antonym will depend on the specific context in which "darted" is used.