Of or pertaining to manipulation; performed by manipulation. [1913 Webster]
Prone to attempt to influence others by devious or subtle psychological means, in order to induce them to do what one wants. [PJC]
manipulative, n.
Any object given to children to encourage them to learn by manipulating physical objects; applied especially to solid objects of varying geometrical shape that can be fit together to form larger aggregates. [PJC]