1. Given to stealing; addicted to theft; as, a thievish boy, a thievish magpie.
2. Like a thief; acting by stealth; sly; secret. Time’s thievish progress to eternity. (Shak)
3. Partaking of the nature of theft; accomplished by stealing; dishonest; as, a thievish practice. Or with a base and biosterous sword enforce A thievish living on the common road. (Shak) Thievishly, Thievishness.