1. Having value that is not acknowledged
   - unappreciated, unsung

See also: unacknowledged

• blue-green algae
• blue-grey
• blue-headed vireo
• blue-lilac
• blue-pencil
• blue-purple
• blue-ribbon
• blue-rinse
• blue-sky
• blue-violet
• blue-white
• blue-winged teal
• blueback salmon
• Bluebeard
• bluebell
• blueberry
• chip shot
• chipboard
• Chipewyan
• chipmunk
• chipolata
• chipotle
• Chippendale
• chipper
• Chippewa