Below are the words that matched your query...
Unflattering
- showing or representing unfavorably; "an unflattering portrait"; "an uncomplimentary dress"  
 
Unhappier
- generalized feeling of distress  
 - marked by or producing unhappiness; "infelicitous circumstances"; "unhappy caravans, straggling afoot through swamps and canebrakes"- American Guide Series  
 - experiencing or marked by or causing sadness or sorrow or discontent; "unhappy over her departure"; "unhappy with her raise"; "after the argument they lapsed into an unhappy silence"; "had an unhappy time at school"; "the unhappy (or sad) news"; "he looks so sad"  
 - causing discomfort; "the unhappy truth"  
 
Unhappiest
- generalized feeling of distress  
 - marked by or producing unhappiness; "infelicitous circumstances"; "unhappy caravans, straggling afoot through swamps and canebrakes"- American Guide Series  
 - experiencing or marked by or causing sadness or sorrow or discontent; "unhappy over her departure"; "unhappy with her raise"; "after the argument they lapsed into an unhappy silence"; "had an unhappy time at school"; "the unhappy (or sad) news"; "he looks so sad"  
 - causing discomfort; "the unhappy truth"  
 
Unhappy
- generalized feeling of distress  
 - marked by or producing unhappiness; "infelicitous circumstances"; "unhappy caravans, straggling afoot through swamps and canebrakes"- American Guide Series  
 - experiencing or marked by or causing sadness or sorrow or discontent; "unhappy over her departure"; "unhappy with her raise"; "after the argument they lapsed into an unhappy silence"; "had an unhappy time at school"; "the unhappy (or sad) news"; "he looks so sad"  
 - causing discomfort; "the unhappy truth"  
 
Unconvertible
- used especially of currencies; incapable of being exchanged for or replaced by another currency of equal value  
 
Unexchangeable
- used especially of currencies; incapable of being exchanged for or replaced by another currency of equal value  
 - not suitable to be exchanged  
 
Unexcitable
- not easily excited; "an unexcitable temperament"  
 
Unexcited
- not excited; "made an unexcited appraisal of the situation"  
 
Unexciting
- not exciting; "an unexciting novel"; "lived an unexciting life"  
 - not stimulating