1. Not returned in kind
   - unanswered, unrequited

See also: nonreciprocal

• forged
• forger
• forgery
• forget
• forget me drug
• forget-me-not
• forgetful
• forgetful person
• forgetfully
• forgetfulness
• forgettable
• forgetter
• forging
• forgivable
• forgivably
• forgive
• forgiveness
• forgiver
• forgiving
• forgivingly
• forgivingness
• forgo
• forgoing
• forgotten
• forint