This is the 269th most frequent Vietnamese word.
thiếu
"Thiếu" means "lacking" or "missing" in English.
Thiếu is used here to express the state of not having enough or the absence of something necessary (money, in this case).
Tôi đang thiếu tiền để mua cái áo này.
I am lacking money to buy this shirt.
Thiếu here indicates something that has not been done or completed, referring to unfinished work.
Thiếu bài tập hôm qua, bạn cần hoàn thành trước ngày mai.
Missing the homework from yesterday, you need to complete it before tomorrow.
Thiếu is used to indicate the lack of an abstract quality or feeling, specifically confidence in this context.