plongé dans sa réflexion

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{a} meditative
Of or pertaining to meditation

After hearing the news he became meditative.

{a} given to meditation, serious, sad
Meditative describes things that are related to the act of meditating or the act of thinking very deeply about something. Music can induce a meditative state in the listener moments of meditative silence. + meditatively medi·ta·tive·ly Martin rubbed his chin meditatively
Disposed to meditate, or to meditation; as, a meditative man; a meditative mood
{s} contemplative, reflective; of meditation; thoughtful
persistently or morbidly thoughtful