A lot of them are indeed rootless (as far as modern speech is concerned), like delete, derive, defy, deflect, deride, despise, deceive, declare, destroy, demolish, devour, decide, deduce, deject, develop, debate, decant, deprive, deprave, decay and detect, but many also seem to have a root, like devote, detest, deserve, default, decry, defeat, descent, decease, defence, delay, deliberate, deliver, denominate, depart, deploy, depress, design and detail.
Thus ends this demonstration.