Source : Webster's Revised Unabridged Dictionary (1913)

Inconveniently \In`con*ven"ient*ly\, adv.
   In an inconvenient manner; incommodiously; unsuitably;
   unseasonably.

Source : WordNet®

inconveniently
     adv : in an inconvenient manner; "he arrived at an inconveniently
           late hour" [ant: {handily}]