clueless
[形容词]
lacking knowledge, understanding, or awareness about a particular situation or subject

无知的, 糊涂的
airheaded
[形容词]
lacking intelligence or not taking things seriously

心不在焉的, 愚蠢的
Ex: airheaded intern 's constant mix-ups and forgetfulness led to several office mishaps .
unknowledgeable
[形容词]
lacking knowledge, awareness, or understanding about a particular subject or in general

无知的, 缺乏知识的
unperceptive
[形容词]
lacking insight or the ability to discern and understand things accurately

缺乏洞察力的, 无洞察力的
unobservant
[形容词]
lacking the habit or ability to notice, perceive, or pay attention to details in one's surroundings

不注意的, 粗心的

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