1. Difficult to burn
   - fire-retardant, fire-resistant, fire-resistive

See also: incombustible, noncombustible

• rough-leaved aster
• rough-legged hawk
• rough-sand
• rough-skinned newt
• rough-spoken
• rough-stemmed goldenrod
• rough-textured
• roughage
• roughcast
• roughdried
• roughen
• roughened
• roughhewn
• roughhouse
• roughish
• roughleg
• roughly
• roughneck
• roughness
• roughrider
• roughshod
• roughtail stingray
• roulade
• rouleau
• roulette