1. Not anticipated
   "unanticipated and disconcerting lines of development"
   - unforeseen, unlooked-for, out of the blue

See also: unexpected

• ununquadium
• ununtrium
• unusable
• unuseable
• unused
• unusefulness
• unusual
• unusual person
• unusually
• unusualness
• unutterable
• unutterably
• unuttered
• unvaccinated
• unvalued
• unvaned
• unvanquishable
• unvanquished
• unvaried
• unvariedness
• unvarnished
• unvarying
• unveil
• unveiled
• unveiling