Shamima Begum has lost her challenge over the decision to deprive her of British citizenship because she is a threat to national security.
Mr Justice Jay told the semi-secret court dealing with her case that her appeal had been fully dismissed.
The decision means the 23-year-old remains barred from returning to the UK and stuck in a camp in northern Syria.
Ms Begum was 15 years old when she travelled to join the self-styled Islamic State group in 2015.
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