Synonyms for Tormenting:

adj.

aggravating (adjective)
teasing, infuriating, vexing, grating, annoying, irritating, exacerbating, bothersome, pestering, Harassing, disturbing, exasperating, Enraging, perturbing, Rankling, troublesome, Irksome, aggravating, upsetting, Bedeviling, inflaming, antagonizing.
painful (adjective)
painful, irritating, grievous, arduous, hurtful, disagreeable, severe, annoying, stabbing, acute, unbearable, bitter, biting, woeful, aching, Cramping, uncomfortable, trying, nagging, grueling, burdensome, harrowing, bothersome, crushing, withering, Torturing., troublesome, piercing, cutting, sore, unpleasant, wrenching, stinging, throbbing, insufferable, chafing, cruel, oppressive, anguishing, horrendous, odious, Besetting, agonizing, Irksome, excruciating, distressful, offensive, smarting, Gnawing, miserable, aggravating, inflaming.
threatening (adjective)
frightening, admonishing, foreboding, threatening, forewarning, bullying, Looming, warning, Hinting, scary, Browbeating, intimidating.
very painful (adjective)
excruciating, agonizing, disturbing, racking, distressing, anguishing, torturous, harrowing, suffering.

n.

pain, torturous.

v.

aggravating (verb)
Bothering, nagging, badgering, irking, baiting, Fretting, hassling, peeving, needling, Discomposing, Envenoming, Arousing, troubling, Harrying.
paining (verb)
racking, Paining, stitching, suffering, hurting, Discomforting, distressing, Afflicting.
threatening (verb)
Bulldozing, Scaring, Harassing.

Other synonyms:

torturous. Other relevant words:
torturous.

Usage examples for tormenting

  1. Am obliged always to have my room darkened when I write, to keep them from tormenting me. – Travels in the Great Desert of Sahara, in the Years of 1845 and 1846 by James Richardson
  2. I asked, in feigned surprise, for I could not resist tormenting her a little. – The Prisoner of Zenda by Anthony Hope
  3. Then why was he tormenting her thus- playing with her as a cat might play with a mouse? – The Way of an Eagle by Ethel M. Dell