opposite of 'confident'

What is the opposite of 'confident'? I thought it was 'inconfident' but I cannot find the word in the dictionaries that I have.

Thanks in advance.

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Originally Posted by Tan Elaine

What is the opposite of 'confident'? I thought it was 'inconfident' but I cannot find the word in the dictionaries that I have.
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There is no 'in-/un-/ confident'. We can say 'lacking in confidence', or: Antonym of confident | Synonym.com

How about insecure?