The Collaborative International Dictionary
Inconstance
Inconstance \In*con"stance\, n. [F. See Inconstancy.]
Inconstancy.
--Chaucer.
Douglas Harper's Etymology Dictionary
inconstance
late 14c., from Old French inconstance (13c.), from Latin inconstantia, noun of quality from inconstans (see inconstant).
Wiktionary
inconstance
n. (obsolete form of inconstancy English)