unslotWhere does the verb unslot come from? The earliest known use of the verb unslot is in the 1820s. OED's earliest evidence for unslot is from 1827, inunslotted — adj. Not slotted. unslothful — adj. Not slothful. unslothfully — adv. In an unslothful manner. unslothfulness — n. Quality of being unslothful.