There are several things to be said often from my respectors.
One of them is "to have unfounded confidence".
Even if I overslept and seems to be late, I have confidence without grounds.
Even though I should have a nap for a while, when I fall asleep for about 4 hours, I have confidence without foundation.
Even though I tweeted, there was no response at all, I have confidence without basis.
Any time, "have confidence without basis"!