"bind", "bond", "cleave", "cling", "cohere", "hold fast", "stand by", "stick", "stick by" and "stick to"
stick
stick to, attach to, cling to, glue to, fix to, fasten to, hold fast
bond, cling, cohere
A synonym for adhere would be 'bond' or 'cling'an antonym would then be 'repel'