hawk-eyedˈhawk-eyed adjective 
quick to notice small details SYN observant
quick to notice small details SYN observant- uncommon
- uncommonly
- uncomplaining
- uncomplainingly
- uncomprehending
- uncomprehendingly
- uncompromising
- uncompromisingly
- unconcern
- unconcerned
- unconcernedly
- unconditional
- unconditionally
- unconfirmed
- unconnected
- unconscionable
- unconscionably
- unconscious
- unconsciously
- unconsciousness
- unconsidered
- unconstitutional
- unconstitutionally
- uncontested
- uncontrollable