1. Difficult to place in an adoptive home

Antonym: adoptable

• sight gag
• sight setting
• sight unseen
• sighted
• sightedness
• sighting
• sightless
• sightlessness
• sightly
• sightread
• sightreader
• sights
• sightsee
• sightseeing
• sightseer
• sightsing
• sigil
• sigillography
• SIGINT
• sigma
• Sigmodon
• Sigmodon hispidus
• sigmoid
• sigmoid colon
• sigmoid flexure