un·rid·dle 
(ŭn-rĭdl)
(ŭn-rĭdl)tr.v. un·rid·dled, un·rid·dling, un·rid·dles
To solve or explain (a riddle or mystery).
un·riddler n.
- unabatedly
- unable
- unabridged
- unaccented
- unacceptability
- unacceptable
- unacceptably
- unaccommodated
- unaccompanied
- unaccomplished
- unaccountability
- unaccountable
- unaccountably
- unaccounted-for
- unaccredited
- unaccustomed
- unaccustomedly
- unachievable
- unacknowledged
- una corda
- unacquainted
- unaddressed
- unadjusted
- unadorned
- unadulterated