* Reject: This is a direct opposite of "choose" in the sense of actively deciding against something.
* Refuse: Similar to "reject," but with a stronger implication of unwillingness.
* Decline: This is a more formal way of saying "reject."
* Dismiss: This implies ignoring or considering something unimportant.
* Abandon: This suggests giving up on something completely.
* Forgo: This means to give up something, often voluntarily.
* Pass: This implies not choosing something, often in a passive sense.
The best opposite word for "choose" depends on the specific situation and the nuance you want to convey.