When I ask my ISTP fiance if I'm dependable, he gives me this coy look that communicates something like, "You're kidding right?" To him (who is very dependable in a traditional sense) I seem very flighty at first glance. What baffles him about me the most is that just because I say I'm going to do something / want something / like something doesn't mean I'm actually going to do it / want it / like it the next day. For him, dependable means a 1.0 correlation between what you say and what you do. I'm just not built that way. I say stuff all the time that I later change my mind about. I told him yesterday that I wanted to learn Italian. I absolutely meant it when I said it. But today, upon reflection, I've reconsidered and moved this goal low down on my to do list.
And, yet when I ask my ISTP why he would be in a serious relationship with me if I'm so flighty, he surprises me by saying this:
"At first I thought you were flighty. You don't always do what you say which drove me crazy in the beginning. Now I've learned to see your dependability. You are dependable, but in a completely different way than me. You're very loyal, loving, and honest. If you say something, I know you mean it IN THE MOMENT you say it. I've just learn to accept that in the next moment, you might say something completely different. It's like you're always re-evaluating your priorities and feelings... And you aren't afraid to change them if needed. Whereas I can get stuck in a rut and never change mine... even in the light of new information." - Esoteric Wench's Fiance
I think what he's trying to say here is that I'm always and earnestly trying to understand my environment (dominant Ne). I'm not afraid to change my priorities and behavior based on the latest information (Ji aka Pness). In these two ways I'm very, very dependable.