1. (of a chemical reaction or compound) occurring or formed with the liberation of heat
   - exothermic, exothermal

See also: energy-releasing, exoergic

• unrig
• unrigged
• unrighteous
• unrighteously
• unrighteousness
• unrimed
• unrip
• unripe
• unripened
• unrivaled
• unrivalled
• unroll
• unromantic
• unromantically
• unroofed
• unrouged
• unrounded
• unruffled
• unruliness
• unruly
• unsaddle
• unsaddled
• unsafe
• unsafely
• unsaid