Unaware of the true worth or significance of things; lacking the ability to distinguish between what is valuable and what is not.
小明从小娇生惯养，对家里摆放的古董家具完全不知贵贱，常常在上面乱涂乱画。
Having been pampered since childhood, Xiao Ming is completely unaware of the true value of the antique furniture in his home, often scribbling on it.
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