In his 1987 book The Game of Words, Willard R. Espy offered a poem of “forgotten positives”:

I dreamt of a corrigible, nocuous youth,
Gainly, gruntled, and kempt;
A mayed and a sidious fellow, forsooth —
Ordinate, effable, shevelled, ept, couth;
A delible fellow I dreamt.

Correspondingly, he pointed out, many common words ending in -less seem to have no opposites ending in -ful:

A tailful dog, one leaf-ful spring
Set out for toothful foraging,
And as he dug in rootful sod,
Paid voiceful tribute to his God.
At which, a feckful, loveful lass,
Whose strapful bodice charmed each pass-
Erby, cried out, “O timeful sound!
O ageful, lifeful, peerful hound!”