1. Characterized by a lightly pert and exuberant quality
   - irreverent, pert, saucy 
2. Not pertinent to the matter under consideration
   "mentioned several impertinent facts before finally coming to the point"
   - extraneous, immaterial, orthogonal 
3. Improperly forward or bold
   "impertinent of a child to lecture a grownup"
   - fresh, impudent, overbold, smart, saucy, sassy [N. Amer], wise, lippy

See also: beside the point, forward, impertinence, irrelevant, spirited

• cupric
• cupric acetate
• cupric sulfate
• cupric sulphate
• cupriferous
• Cuprimine
• cuprite
• cupronickel
• cuprous
• cupular
• cupulate
• cupule
• Cuquenan
• Cuquenan Falls
• cur
• curability
• curable
• curableness
• curacy
• curandera
• curandero
• curare
• curassow
• curate
• curate cycloid