Disorientated is the British spelling/pronunciation (originally from a French word) of the US slurred and lazy variant disoriented. Meaning: Confused. To lose one's sense of direction.
It appears in all English dictionaries (as opposed to US-English) and the word has been in use since (at least) circa 1704.
Whilst walking around the numerous corridors of his new college, George became disorientated and couldn't find his way back out.
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