1) Lacking variety or excitement; dull.
2)Monotonous talk or routine.
Screw all this humdrum! I'm going out for a drink.
Somebody who feels comfortable whilst in the home enviroment, and rarely leaves the bounderies of their property. They may feel preasured to communicate, or may simply feel repulsed by the freedom in which other people mix and intergrate. Others see them as "boring" or "drabsters," with Glibster a modern definition of a Humdrum.
Check Mike over there chilling with the same 3 people he has done since Pre- School, is that guy Humdrum or what?