IPA: /ˈstʌmpɪli/
KK: /ˈstʌmpɪli/
In a manner that is short and thick, resembling a stump.
The tree was cut down, leaving a stumpily shaped base behind.
Stumpily is formed from "stump" (from Old English *stumpa*, meaning a truncated or cut-off part) and the suffix "-ily" (meaning in a manner). The word describes something done in a manner that is clumsy or awkward, akin to the way a stump appears.
Think of a 'stump' as a cut-off part that is often clumsy or awkward, and remember that 'stumpily' means doing something in a clumsy manner.