out of hand

out of hand (without any more thought; without reservation or deeper examination) — сходу, без раздумий, с порога, без размышлений
reject/refuse/dismiss sb/sth out of hand
(reject sb or sth without thinking, throw away quickly; without any thought or study) — отказаться от чего-л. или отмести что-л. сходу, с порога, без размышлений
If you refuse something out of hand, you refuse it completely without thinking about it or discussing it

…My idea was dismissed out of hand. It's an idea that shouldn't be dismissed out of hand (=dismissed immediately and completely).
…Moving to London is certainly a possibility. I wouldn't dismiss it out of hand. (Cambridge Idioms Dictionary)
… They were forced to do the sort of work that anyone who wasn't a prisoner would have rejected out of hand.
… Fred is so contrary that they rejected him out of hand when his name came up for a committee position. (McGraw-Hill Dictionary of American Idioms)
… If the apples aren't from B.C. he rejects them out of hand.
… Aromatherapy was dismissed out of hand by traditional doctors. (LDOCE)

see also
[get out of hand]