1. Having no gills
   - abranchial, abranchious, gill-less

Antonym: branchiate

• unpardonably
• unparented
• unparliamentary
• unpartitioned
• unpassable
• unpasteurised
• unpasteurized
• unpatented
• unpatriotic
• unpatriotically
• unpatronised
• unpatronized
• unpatterned
• unpaved
• unpeaceable
• unpeaceful
• unpeeled
• unpeg
• unpeople
• unpeopled
• unperceivable
• unperceived
• unperceiving
• unperceptive
• unperceptiveness