1. Not returned in kind
   "unrequited (unanswered) love"
   - unreciprocated, unrequited

See also: nonreciprocal

• butterfly
• butterfly bush
• butterfly collector
• butterfly effect
• butterfly flower
• butterfly nut
• butterfly orchid
• butterfly orchis
• butterfly pea
• butterfly plant
• butterfly ray
• butterfly stroke
• butterfly valve
• butterfly weed
• butterfly-shaped
• butterflyfish
• butterhead lettuce
• buttermilk
• buttermilk biscuit
• buttermilk pancake
• butternut
• butternut squash
• butternut tree
• butterscotch
• butterweed