If "stream" refers to a flowing body of water:
* Stagnant: implies a lack of movement or flow.
* Still: describes water that is not moving.
* Pool: a body of still water.
* Lake: a large body of still water.
If "stream" refers to a continuous flow of something (like data or information):
* Intermittent: occurring at irregular intervals.
* Discontinuous: having breaks or gaps.
* Static: not changing or moving.
* Stopped: no longer flowing.
If "stream" refers to a series of events or actions:
* Interruption: something that breaks the continuity.
* Pause: a temporary stop.
* Halt: a complete stop.
The best antonym for "stream" will depend on the specific context in which the word is used.