lost in thought

not aware of what is happening around you because you are thinking about something else I didn't answer right away because I was lost in thought.

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

Name	Pronounced	Usage
Matilda	[mə'ti:ldə]
John	JAHN (English)	English, Biblical
Harrington	['hæriŋtən]
OfÉLia	-	Portuguese
Bill	[bil]
Lorene	LAWR-een	English