When "impose" means to force something on someone:
* Allow
* Permit
* Accept
* Respect
* Consider
* Encourage
* Welcome
When "impose" means to place a burden on someone:
* Relieve
* Ease
* Help
* Support
* Assist
When "impose" means to put oneself forward in an unwelcome way:
* Withdraw
* Refrain
* Decline
* Disengage
When "impose" means to establish something forcefully:
* Remove
* Abolish
* Cancel
* Discard
To determine the most accurate antonym, consider the specific meaning of "impose" in the sentence.