ETYMOLOGY
from shittle (obsolete, fickle, flighty, inconstant) + witted
EXAMPLE
“… I am aferd þat Jon of Sparham js so schyttyl-wyttyd þat he wyl sett hys gode to morgage to Heydon, or to sum oþer of vwre gode frendys, but jf I can hold hym jnne þe better ere ȝe kom hom…”
From: Paston Letters and Papers of the Fifteenth Century
Margaret Paston to Jon Paston, 1448
Lexicophilia 