1. Not restrained or controlled
   "an unchecked temper"
   - unbridled, uncurbed, ungoverned

See also: unrestrained

• undesirability
• undesirable
• undesirably
• undesired
• undesiring
• undesirous
• undestroyable
• undetectable
• undetected
• undeterminable
• undetermined
• undeterred
• undeveloped
• undeviating
• undiagnosable
• undiagnosed
• undies
• undifferentiated
• undigested
• undignified
• undiluted
• undiminished
• undimmed
• undine
• undiplomatic