To not think it is so; to disagree with or not approve of something.
然是，对。不认为是对的。表示不同意或否定。
宋·苏轼《再乞罢详定役法状》右臣先曾奏论前衙一役，只当招募，不当定差，执政不以为然。”
When she suggested changing the plan, he shook his head, implying that he thought otherwise.
Learn the next connected idiom: 不以为然 (bù yǐ wéi rán) → 燃眉之急 (rán méi zhī jí)
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