seldom

Từ điển WordNet v3.1 - WordNet Dictionary

adverb

not often (Freq. 10)
- we rarely met
• Syn:
rarely
• Ant:
often (for: rarely)
• Derived from adjective:
rare (for: rarely)

• Từ trái nghĩa / Antonyms:
  frequently, often, oftentimes, oft, ofttimes