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lost in thought

Concentrating on or pondering over something. For example, Gwen didn't hear a word you said; she was lost in thought.

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

Related Words for lost in thought

bemused, obsessed, fascinated, distracted, engaged, forgetful, engrossed, absorbed, melancholy, wise, pensive, analytical, cerebral, reasonable, earnest, studious, rational, reflective, sober, serious