constant 8 Associations

steadfast (similar term) staunch (similar term) unswerving (similar term) unfailing (similar term) unflagging (similar term) faithful (related term) invariable (related term)

inexhaustible 13 Associations

renewable (similar term) unfailing (similar term) exhaustible (antonym)

infallible 10 Associations

foolproof (similar term) unfailing (similar term) inerrable (similar term) inerrant (similar term) unerring (similar term) fallible (antonym)