Unforeseeing

And then he seemed to discern in her something that was familiar, something which carried him back into a joyous and unforeseeing past, before the necessity of taking thought had made the heavens gray.

Source: wiktionary

It was that spirit sent Oliver Cromwell himself packing for America, though a heedless and ill-advised and unforeseeing King would not let him go.

Source: wiktionary