ETYMOLOGY
n. 1.: ? variant of dumble, dummel (Eng. dial., a stupid, slow person)
n. 2.: a variant or alteration of dimble (a deep, shady dell, a dingle)
vb. 4.: apparently a nasalized form of drubble (to trouble, disturb), parallel to drumbly, drumly (adj.) from drubly; but possibly a back-formation from the adj.
vb. 5.: blend of drum and rumble
EXAMPLE
“…Yea but what am I, a Scholer, or a scholemaister, or els some youth.
A Lawier, a studient or els a countrie cloune
A Brumman, a Baskit maker, or a Baker of Pies,
A flesh or a Fishmonger, or a sower of lies:
A Louse or a louser, a Leeke or a Larke:
A Dreamer, a Drommell, a fire or a sparke:
A Caitife, a Cutthrote, a creper in corners,
A herbraine, a hangman, or a grafter of horners…”
(Note: drommell is the earliest variant of drumble)
From: A New Tragicall Comedie of Apius and Virginia
By R.B., 1575
Lexicophilia 