A genuinely worthless word. From TVR Scarcely used words.
So worthless, wwftd doesn't claim it.

unsonsy (un-SON-see) adj. 1. luckless; not fortune; ill-omened. 2.
not handsome; plain.

From part of a poem:

AE day a wan'ring fiddler, lame,
Upon a brig sat far frae hame;
Frae tim'er case alias fram,
He drew's bread winner,
And on the range-wa' laid the same,
Alas poor sinner!
For lo, a wild unsonsy blast,
Down to the stream his fiddle cast;
Whilk hopeless on the current past,
Wi' monie a hobble,
Leaving its master all aghast,

And if his fiddling matched the poetry, good riddance to his fiddle.