| arduously(adverb, easy, badly, severely, vigorously) |
| hard(adverb, easy, badly, thoroughly, fully) |
| strenuously(adverb, badly, severely, vigorously, earnestly) |
| industriously(adverb, vigorously, earnestly, actively, hastily) |
| difficultly(adverb, easy, difficultly) |
| onerously(adverb, difficultly, strenuously) |
| toilsomely(adverb, badly, severely, vigorously, hardly) |
| assiduously(adverb, thoroughly, vigorously, earnestly, hastily) |
| diligently(adverb, vigorously, earnestly, actively, hastily) |
| hardly(adverb, badly, severely, vigorously, extremely) |
| indefatigably(adverb, vigorously, earnestly, actively, hastily) |
| sedulously |
| heavily(adverb, easy, seriously, deeply, slowly) |
| mightily(adverb, forcefully) |
| painfully(adverb, badly, severely, vigorously, disturbingly) |
| toughly(adverb, difficultly) |
| with difficulty(expression, idiom, adverb, badly, severely) |
| ardently(adverb, vigorously, earnestly, actively, hastily) |
| awkwardly(adverb, badly, severely, vigorously, hardly) |
| burdensomely(adverb, hard, badly, severely, vigorously) |