All adverbs

aground
with the bottom lodged on the ground
 
aloof
in an aloof manner
 
seasonally
depending on the season
 
herein
in this place or thing or document
 
syntactically
with respect to syntax
 
unhappily
in an unpleasant way
 
busily
in a busy manner
 
constrainedly
in a constrained manner
 
here
at this time; now
 
underground
in or into hiding or secret operation
 
plum
exactly
 
back
in or to or toward a past time
 
endlessly
(spatial sense) seeming to have no bounds
 
officially
with official authorization
 
in detail
thoroughly (including all important particulars)
 
tensely
in a tense manner
 
covertly
in a covert manner
 
obligatorily
in an obligatory manner
 
medically
involving medical practice
 
post-paid
having the postage paid by the sender
 
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