out of hand
From Longman Dictionary of Contemporary Englishout of handout of handREFUSEwithout even stopping to consider what someone has suggested, asked for etcreject/dismiss/refuse etc something out of hand Aromatherapy was dismissed out of hand by traditional doctors. → handExamples from the Corpusreject/dismiss/refuse etc something out of hand• After dismissing it out of hand, the neighbor called back the same night and said it might be worth considering.