wack 
(wăk) Slang
(wăk) Slang n.
A person regarded as eccentric.
adj. wack·er, wack·est
Very bad: walked out of a really wack movie.
[Back-formation from WACKY.]
- unassertively
- unassertiveness
- unassisted
- unassuming
- unassumingly
- unattached
- unattainability
- unattainable
- unattainably
- unattended
- unattested
- unattributed
- unau
- unaudited
- unavailability
- unavailable
- unavailing
- unavailingly
- una voce
- unavoidability
- unavoidable
- unavoidableness
- unavoidably
- unaware
- unawarely