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absent, absent-minded, abstracted, distrait, faraway, inattentive, preoccupied.
Bemusement is the characteristic of being bemused by someone or something - thoughtful, preoccupied, or perplexed and bewildered.
One option is pensive.
I thought of dancing and I did it. :P ;*
Busy, distracted, absorbed, engaged, immersed, engrossed, rapt, lost in thought, oblivious...