Akademik

bumble

v.intr.
1 (foll. by on) speak in a rambling incoherent way.
2 (often as bumbling adj.) move or act ineptly; blunder.
3 make a buzz or hum.
Derivatives:
bumbler n.
Etymology: BOOM(1) + -LE(4): partly f. bumble = blunderer

Useful english dictionary. 2012.