From The Collaborative International Dictionary of English v.0.48:
Middling \Mid"dling\, a.
Of middle rank, state, size, or quality; about equally
distant from the extremes; medium; moderate; mediocre;
ordinary. "A town of but middling size." --Hallam.
[1913 Webster]
Plainly furnished, as beseemed the middling
circumstances of its inhabitants. --Hawthorne.
[1913 Webster] -- Mid"dling*ly, adv. -- Mid"dling*ness,
n.
[1913 Webster]