— adjustable
— astatic
— changeable
— checkered
— chequered
— concavity
— conceivable
— conceivably
— conceive
— conceived
— concept
— conception
— conceptional
— conceptual
— concubine
— concupiscent
— conspectus
— conspicuous
— conspiracy
— conspirator
— conspire
— distortable
— erratic
— exchangeable
— fickle
— fluid
— inconstant
— jittering
— kaleidoscopic
— kaleidoscopical
— mercurial
— mobile
— open-ended
— quick-change
— quick-drying
— quicksilver
— reversible
— unstable
— volatile