Synonyms of gruelingly

2 Syllables

hardly, roughly, harshly, badly

3 Syllables

awkwardly, arduously, painfully, strenuously, cumbrously, tiredly

4 Syllables

carefully, distressingly, severely, vigorously, toilsomely, unwieldily, ponderously, laboriously, exhaustingly

5 Syllables

inconveniently, agonizingly, cumbersomely, burdensomely