необстоя́тельный

adjective

1.
superficial, sketchy, not thorough
Он дал необстоя́тельный отве́т.
He gave a superficial answer.
Of statements, reports or work done without going into detail.
2.
unreliable, not dependable, flighty
Он челове́к необстоя́тельный, на него нельзя́ положи́ться.
He is an unreliable sort of man; you can't count on him.
Of a person who cannot be counted on to do things properly.
3.
(rare) easy-going, unfussy, uncomplicated
Он простой, необстоя́тельный, с ним легко́.
He is simple and easy-going; he's easy to be around.
Approving, colloquial: of someone who does not make a fuss over things.

Examples

Мне не нравится такой необстоятельный подход к делу.
I don't like this superficial approach to the matter.