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

Antonym: conductive

• light-emitting diode
• light-fingered
• light-footed
• light-green
• light-haired
• light-handed
• light-handedly
• light-headedly
• light-heartedly
• light-minded
• light-mindedness
• light-o'-love
• light-of-love
• light-sensitive
• light-skinned
• light-tight
• light-year
• lightbulb
• lighted
• lighten
• lighten up
• lightening
• lighter
• lighter-than-air
• lighter-than-air craft