Lost in thought is a phrase used to describe someone who is deep in thought, often unaware of their surroundings. The crossword solutions for this term include ABSTRACTED (10 letters), PREOCCUPIED (11 letters), PENSIVE (7 letters), DREAMY (6 letters), RAPT (4 letters), CONTEMPLATIVE (13 letters), MUSING (6 letters), and MOONY (5 letters). All of these words describe someone who is lost in thought, deeply engaged in their own thoughts and ideas, and not paying attention to the world around them.