The ability to be consistent, without flaking out on those who have come to depend on you resulting in lost opportunities in personal, private or professional relationships.
Drummer: "So are you and your original guitarist gonna get your old band back together...?"
Bassist: "I wish bro. He's a killer guitarist & songwriter, but he flakes out and wont show up when he says he will. He has no Constability whatsoever man. I can't waste my time with him"
Used in reference to the comfiness factor of anything upon which one should sit, especially haybales. Unless of course you are allergic to hay, in which case, you miss out on the awesomeness entirely.