ptosis/ʹtohsis/ noun (pl ptoses /-ʹtohseez/)

• unrepresentative
• unrequited
• unreserved
• unresponsive
• unrest
• unrestrained
• unrewarding
• unripe
• unrivalled
• unroll
• unruffled
• unruly
• UNRWA
• unsaddle
• unsafe
• unsaid
• unsatisfactory
• unsaturated
• unsavoury
• unsay
• unscathed
• unschooled
• unscientific
• unscramble
• unscrew