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• s  not consciously observing
  looked through him with blank unseeing eyes
• s  lacking sight

• A blind man sits amidst the rubble, unseeing of the immensity of the destruction all around.
• On the beach, a severed head stares unseeing at the sky.
• His difficulties in getting funds to maintain this reputation in her unseeing eyes supply most of the complications.

• unobservant
• eyeless
• sightless