 Adjective, holding fast, inclined to hold fast, apt to retain, retentive. Hi, Daily Definition. Hi, Grip. Nope, try again. About 20 seconds. 681-1231, 681-1336. Give a call. Get it right. We'll get you qualified. Daily Definition, your guess? What's your guess today? Tenacious. It is. You're right. Tenacious is right. Who's this? Marv.