Pardon me for a moment if I absorb myself in my own thoughts.

He stood with hands behind back, head bent a little, looking down at the ground, absorbed in his thoughts.

For a moment he stood absorbed in his own thoughts.

Michael walked on, speaking little, absorbed in his own thoughts.

But this young man was absorbed in his own thoughts.

People are absorbed in their own thoughts and aren't communicating well.

Neither was much for small talk and both were absorbed in their own thoughts.

She sat staring straight ahead, absorbed in her own thoughts.

Each was absorbed in his own thoughts; and for many hours neither of them spoke.

But before he could become absorbed in his thoughts, the door was unlocked.