1. Not often.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• ynoften,
• hnoften,
• jnoften,
• inoften,
• 8noften,
• 7noften,
• uboften,
• umoften,
• ujoften,
• uhoften,
• uniften,
• unkften,
• unoffen,
• uhnoften,
• unofften,
• Unoftan,
• unoffin,
• unoftin,
• Unoftenly,
• Unofton

The adjective form of the word "unoften" is "rare".

The plural form of the word "unoften" is "unoftens".

The singular form of the word "unoften" is "unoften".