Constancy :: Constancy (n.) The state or quality of being constant or steadfast; freedom from change; stability; fixedness; immutability; as, the constancy of God in his nature and attributes..
Constancy :: Constancy (n.) Fixedness or firmness of mind; persevering resolution; especially, firmness of mind under sufferings, steadiness in attachments, or perseverance in enterprise; stability; fidelity..
Inconstancy :: Inconstancy (n.) The quality or state of being inconstant; want of constancy; mutability; fickleness; variableness.
Inconstant :: Inconstant (a.) Not constant; not stable or uniform; subject to change of character, appearance, opinion, inclination, or purpose, etc.; not firm; unsteady; fickle; changeable; variable; -- said of persons or things; as, inconstant in love or friendship..