1. Deliberate, intentional, premeditated, voluntary refer to something not happening by chance. Deliberate is applied to what is done not hastily but with full realization of what one is doing: a deliberate attempt to evade justice. Intentional is applied to what is definitely intended or done on purpose: an intentional omission. Premeditated is applied to what has been planned in advance: a premeditated crime. Voluntary is applied to what is done by a definite exercise of the will and not because of outward pressures: a voluntary enlistment. 3. See slow.

Did you mean overelaborate?