1. Having no adverse effect

See also: innocuous

• rifampin
• rife
• riff
• riffed
• Riffian
• riffle
• riffler
• riffraff
• rifle
• rifle ball
• rifle butt
• rifle grenade
• rifle range
• rifle shot
• riflebird
• rifled
• rifleman
• rifleman bird
• rifler
• rifling
• rift
• rift valley
• Rift Valley fever
• rig
• rig up