Antonyms of adv often

1 of 3 senses of often

Sense 1
frequently, often, oftentimes, oft, ofttimes -- (many times at short intervals; "we often met over a cup of coffee")
       Antonym of rarely (Sense 1)
      => rarely, seldom -- (not often; "we rarely met")

Synonyms of adv often

3 senses of often

Sense 1
frequently, often, oftentimes, oft, ofttimes -- (many times at short intervals; "we often met over a cup of coffee")

Sense 2
much, a great deal, often -- (frequently or in great quantities; "I don't drink much"; "I don't travel much")

Sense 3
often -- (in many cases or instances)