1. Not able to conduct heat or electricity or sound
   - nonconducting, non-conducting

Antonym: conductive

• stiffen
• stiffener
• stiffening
• stiffish
• stiffly
• stiffness
• stiffy
• stifle
• stifled
• stifler
• stifling
• stiflingly
• stigma
• stigmasterol
• lacrimal
• lacrimal apparatus
• lacrimal artery
• lacrimal bone
• lacrimal duct
• lacrimal gland
• lacrimal sac
• lacrimal secretion
• lacrimal vein
• lacrimation
• lacrimator