ETYMOLOGY
from ill (adj.) or (adv.) + looking, present participle of look (vb.)
EXAMPLE
“… That gawdy eare-wrig, or my lord your patron,
Whose pensioner you are. — I ‘le teare thy throat out,
Sonme of a cat, ill-looking hounds-head, rip up
Thy ulcerous maw, if I but scent a paper,
A scroll, but halfe as big as what can cover
A wart upon thy nose, a spot, a pimple,
Directed to my lady: it may prove
A mysticall preparative to lewdnesse. …”
From: The Broken Heart
By John Ford, 1633
Lexicophilia 