agonizing

adj

1. Causing physical or mental agony.

   “It was an agonizing twenty-minute wait for the results.”

verb

1. (form-of, gerund, participle, present)present participle and gerund of agonize

noun

1. The act of one who agonizes.

   “I never breathed a word of my doubts and mental agonizings to my mother; I spoke to her only of my bodily sufferings; yet she knew it all, and I knew that she knew.”