clueless

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There was one small flaw in my master plan; I was utterly and absolutely clueless.
但我的宏伟蓝图有一个小小的瑕疵：我对这个行业根本一无所知。
Written in a tone bordering on exasperation, the report quotes one US officer as saying: “I don't want to say we're clueless, but we are.
报告的语气接近于激愤，其中引用了一位美国官员的话：“我不想说我们无知，但我们确实是两眼一抹黑。
Other people around you look so cool and you often feel left behind or clueless, or that the friends you do have do not really understand you.
你周围的人看上去如此冷酷，让你觉得被抛在了一边，感到很无助，或者是你的朋友并不真正了解你。

"Kook means the clueless beginner who paddles his surf board out to the other surfers in the lineup and starts chattering away like it's a cocktail party, completely ignores all the finely-tuned protocols of surf that have developed over decades."
But now, I want to raise a huge developmental puzzle and the puzzle is there are some ways in which babies are-- not just babies,but young children are very clueless when it comes to people.
但现在我想提出一个发展心理学的难题,这个难题是,当提及与人类有关的知识时,婴儿,甚至是幼儿,在某些方面都是完全不知的
耶鲁公开课 - 心理学导论课程节选
For example,to have--to give the impression of being provincial with-- like you just arrived at the train from Brittany in Gare Montparnasse, and you're just so totally out of it and then that's all you want to do, and you're sort of clueless.
例如,里面描述了乡下人的行为,就像你刚到了布列塔尼的蒙帕纳斯火车站,你一无所知,你当时却饥肠辘辘想急于充饥,简直就像丈二和尚
耶鲁公开课 - 1871年后的法国课程节选

Things started going wrong for Caribou well before it started putting up clueless Facebook posts.
FORBES: Caribou Coffee Customers Attack on Facebook -- But Here's What They're Missing

If you describe someone as clueless, you are showing your disapproval of the fact that they do not know anything about a particular subject or that they are incapable of doing a particular thing properly.