One of the mysteries of the English language finally explained.
1‘he is in a world of his own and is frequently carried away by his own flights of fancy’
absent-minded, preoccupied, absorbed, engrossed, far away, somewhere else, not there, not with us, abstracted, with one's head in the clouds, daydreaming, dreamy, inattentive, distracted, thoughtful, pensive, lost in thought, deep in thought, immersed in thought, wool-gathering, in a brown study, musing, brooding, absent, distrait, heedless, oblivious
informal miles away
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