All adverbs

uncertainly
showing lack of certainty
 
on the Q.T.
in secrecy; not openly
 
contradictorily
in a contradictory manner
 
unintelligibly
in an unintelligible manner
 
healthily
in a levelheaded manner
 
monolingually
in a monolingual manner
 
bleakly
without hope
 
acoustically
with respect to acoustics
 
sky-high
(with verb `to blow') destroyed completely; blown apart or to pieces
 
pertinently
in a pertinent way
 
tartly
in a tart manner
 
idyllically
in an idyllic manner
 
unbelievably
in an unbelievable manner
 
blithely
in a joyous manner
 
hesitantly
with hesitation; in a hesitant manner
 
dear
at a great cost
 
once more
anew
 
rotationally
in a rotational manner
 
institutionally
by an institution
 
caudally
toward the posterior end of the body
 
  List More