WordNet sense 1 (a person who evokes boredom):

dullard

WordNet sense 2 (a high wave (often dangerous) caused by tidal flow (as by colliding tidal currents or in a narrow estuary)):

eager, aegir, eagre, tidal bore

WordNet sense 3 (diameter of a tube or gun barrel):

caliber, gauge, calibre

WordNet sense 4 (a hole or passage made by a drill; usually made for exploratory purposes):

bore-hole, drill hole

WordNet sense 5 (cause to be bored):

tire

WordNet sense 6 (make a hole with a pointed power or hand tool):

drill