Ancient is related to Modern, Often is related to
1) Always
2) Never
3) Frequently
4) Seldom
5) Rare

• Ancient opposite modern
  oftent opp never
• 10 years agoHelpfull: Yes(1) No(0)
• 5)Rare.............
• 10 years agoHelpfull: Yes(1) No(0)
• 4)Seldom
  
  Antonyms of Ancient is Modern.In the same way ,Antonyms of Often is Seldom.
• 7 years agoHelpfull: Yes(0) No(0)
• ancient opposite is modern and often opposite is rare
• 6 years agoHelpfull: Yes(0) No(0)