Merriam-Webster's Collegiate® Dictionary, 11th Edition
WOBBLE
I. verb also wabble (wobbled; also wabbled; wobbling; also wabbling) see: waver
Date: 1657
intransitive verb
1. to move or proceed with an irregular rocking or staggering motion or unsteadily and clumsily from side to side, tremble , quaver , waver , vacillate , transitive verb to cause to wobble, wobbler also wabbler noun wobbliness also wabbliness noun wobbly also wabbly adjective
II. noun also wabble
Date: 1699
1. a hobbling or rocking unequal motion (as of a wheel unevenly mounted), an uncertainly directed movement, an intermittent variation (as in volume of sound)