Dumb but not imbecilic. Dumb is "I point you that way and tell you to walk forwards and you walk forwards." That's useful, predictable, reliable. If I point you

Dumb but not imbecilic. Dumb is "I point you that way and tell you to walk forwards and you walk forwards." That's useful, predictable, reliable. If I point you that way and tell you to walk forwards and you maybe walk for a few seconds but then forget what you were doing and decide now's a good time to call your mom, then you're not useful.