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The Collaborative International Dictionary
Subsultory

Subsultory \Sub*sul"to*ry\, a. [L. subsilire, subsultum, to spring up; sub under + salire to leap.] Bounding; leaping; moving by sudden leaps or starts. [R.] -- Sub*sul"to*ri*ly, adv. [R.]

Flippancy opposed to solemnity, the subsultory to the continuous, -- these are the two frequent extremities to which the French manner betrays men.
--De Quincey.

Wiktionary
subsultory

a. Bounding; leaping; moving by sudden leaps or starts.