1. Characterized by adultery
   "extramarital affairs"
   - adulterous, extracurricular

See also: illicit

• unilateralism
• unilateralist
• unilaterally
• unilingual
• unilluminated
• unilluminating
• unilocular
• unimaginable
• unimaginably
• unimaginative
• unimaginatively
• unimagined
• unimitable
• unimodal
• unimpaired
• unimpassioned
• unimpeachable
• unimpeachably
• unimpeded
• unimportance
• unimportant
• unimposing
• unimpregnated
• unimpressed
• unimpressionable