rare. [f. as prec. + -NESS.] Voluntary action; spontaneity.
1623. W. Sclater, Tythes, f 2 b. Law is not here opposed to no Law, or iniunction to vltroneousnesse of Tything.
185861. J. Brown, Horae Subs. (1863), 222. The law of personality, of ultroneousness, or free will, that which in a great measure makes us what we are.