If you describe someone or their behaviour as presumptuous, you disapprove of them because they are doing something that they have no right or authority to do. 擅自作主的
adjective [原级]专横的;放肆的;冒昧的
It would be presumptuous to judge what the outcome will be. 断定结果将会如何未免冒失。
presumptuous
“ -ous” ⌜ 表示具有某种性质的 - indicating having the quality of ~ ⌟