What does the word suffering mean?

Usage examples for suffering

  1. He is suffering- he is very lonely without me; but in a little while we shall be together." – Lavender and Old Lace by Myrtle Reed
  2. Penny, you're suffering from too much heat. – Swamp Island by Mildred A. Wirt
  3. Faith tried to answer, but no words would come, and, touched by the white suffering of her face, the maid tried to persuade her to lie down. – The Beggar Man by Ruby Mildred Ayres