Antonyms for the phrase "put in motion" would include phrases such as "halted," "stopped," "static," "stationary," "at rest," "inactive," "immobile," "motionless," "fixed," "frozen," "stuck," "unmoving," "unmoved," and "unaffected." These antonyms indicate a lack of movement or activity, as opposed to setting something into motion or initiating action. It's important to note that these antonyms may be used in different contexts depending on the type of movement being discussed - for instance, "motionless" would be an appropriate antonym for a person standing still, while "fixed" would be more applicable to a machine or piece of equipment that is not operational.