Inconstancy, n.
Etymology: [L. inconstantia.]
The quality or state of being inconstant; want of constancy; mutability; fickleness; variableness. For unto knight there was no greater shame, Than lightness and inconstancie in love. Spenser.
Shades of meaning
Fernald lists inconstancy only as an antonym, under industry.
He lists it without comment; the entries above explain its neighbors.
Synonyms
none given