All adverbs

boyishly
like a boy
 
ponderously
in an uninterestingly ponderous manner
 
awry
away from the correct or expected course
 
astride
with one leg on each side
 
mightily
powerfully or vigorously
 
worryingly
in a manner to cause worry
 
prosperously
in the manner of prosperous people
 
munificently
in a generous manner
 
passively
in a passive manner
 
timorously
in a timorous and trepid manner
 
ne'er
not ever; at no time in the past or future
 
personally
in a personal way
 
languidly
in a languid and lethargic manner
 
attentively
with attention; in an attentive manner
 
identifiably
in an identifiable manner
 
inside
in reality
 
perforce
by necessity; by force of circumstance
 
unsuspectingly
without suspicions
 
usefully
in a useful manner
 
tranquilly
without emotional agitation
 
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