| earnestly(adverb, fast, intensely, fiercely, quickly) |
| faithfully(adverb, absolutely, very, really, thoroughly) |
| forcibly(adverb, fast, fully, intensely, fiercely) |
| hard(adjective, adverb, firm, fast, badly) |
| heavily(adverb, fast, fully, intensely, fiercely) |
| mightily(adverb, strongly) |
| obstinately |
| robustly(adverb, strongly) |
| sharply(adverb, hard, fast, badly, severely) |
| solid(adjective, adverb, severely, strongly, definitely) |
| soundly(adverb, firm, severely, thoroughly, strongly) |
| stalwartly(adverb, powerfully, faithfully, steadfastly, loyally) |
| staunchly |
| steady(adjective, adverb, firm) |
| sternly |
| surely(adverb, absolutely, very, really, exactly) |
| tight(adverb, firm, fast, severely, thoroughly) |
| toughly(adverb, strongly) |
| unalterably(adverb, inelastically) |
| unchangeably(adverb, unalterably) |