General Antonyms:
* Rarely
* Seldom
* Infrequently
* Occasionally
* Sometimes (depending on the context, sometimes can be considered a weaker antonym)
Specific Antonyms:
* Always (if "often" means "most of the time")
* Never (if "often" means "more than once")
Example:
* "He often visits his grandmother." The antonym here could be "He rarely visits his grandmother."
Choose the best antonym based on the specific meaning of "often" in the sentence.