1. in a manner characteristic of a thief; stealthily or dishonestly

Examples

• He glanced thievishly around the room before pocketing the pen.
• The cat crept thievishly toward the fish on the counter.
• She smiled thievishly after taking the last cookie.
• The child looked thievishly at his sister’s candy.
• He moved thievishly through the dark hallway.
• The raccoon acted thievishly as it raided the garbage can.