THIE'VISH, adjective Given to stealing; addicted to the practice of theft; as a thievish boy. Or with a base and boist'rous sword enforce A thievish living on the common road. 1. Secret; sly; acting by stealth; as thievish minutes. 2. Partaking of the nature of theft; as a thievish practice.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI