Synonyms for Grievously:

adv.

adversely (adverb)
disastrously, detrimentally, antipathetically, perilously, inauspiciously, unfortunately, Difficultly, unhappily, catastrophically, unpropitiously, calamitously, unluckily, adversely, unfavorably, tragically.
painfully (adverb)
distressfully, tormentingly, Insufferably, bitingly, sorely, cruelly, torturously, horrendously, severely, acutely, woefully, oppressively, agonizingly, irksomely, witheringly, miserably, aggravatingly, uncomfortably, excruciatingly, irritatingly, unbearably, piercingly, achingly, odiously, distressingly, disagreeably, hurtfully, unpleasantly, gruelingly, troublesomely, painfully, annoyingly, bitterly, arduously, stingingly, tryingly, smartingly, gnawingly, offensively.
seriously (adverb)
distressingly, severely, sorely, acutely, perilously.
sorely (adverb)
distressfully, woefully, painfully.
unfortunately (adverb)
disastrously, unhappily, miserably.

adv

adversely (adverb)
distressfully, tragically, calamitously, miserably, catastrophically, troublesomely, unhappily, detrimentally, adversely, Difficultly, unluckily, woefully, disastrously, unpropitiously, unfortunately, unfavorably, perilously, inauspiciously, antipathetically.
badly (adverb)
sorely.
painfully (adverb)
distressfully, tormentingly, Insufferably, bitingly, sorely, cruelly, torturously, horrendously, severely, acutely, woefully, oppressively, agonizingly, irksomely, witheringly, miserably, aggravatingly, uncomfortably, excruciatingly, irritatingly, unbearably, piercingly, achingly, odiously, distressingly, disagreeably, hurtfully, unpleasantly, gruelingly, troublesomely, painfully, annoyingly, bitterly, arduously, stingingly, tryingly, smartingly, gnawingly, offensively.
seriously (adverb)
distressingly.

Other synonyms:

adv
disastrously, distressfully, unfortunately, woefully.
n.
painfully.

Usage examples for grievously

  1. The young inventor was grievously disappointed. – Tom Swift and his Electric Runabout or, The Speediest Car on the Road by Victor Appleton
  2. 14. It was presented that Stephen Shepherd by night struck his sister with a knife and grievously wounded her. – Our Legal Heritage, 4th Ed. by S. A. Reilly
  3. Dr. Jeune was grievously annoyed, but, with the generosity which was always characteristic of him, he at once accorded us his friendship, and remained my most warm and honoured friend till his death about ten years afterwards. – Story of My Life, volumes 1-3 by Augustus J. C. Hare