| firmly(adverb, firm, fast, intensely, fiercely) |
| constantly(adverb, definitely, resolutely, steadily, determinedly) |
| resolutely(adverb, definitely, tenaciously, determinedly, obstinately) |
| faithfully(adverb, tenaciously, steadily, loyally, stalwartly) |
| unwaveringly(adverb, resolutely, determinedly, obstinately, stubbornly) |
| firm(adverb, hard, fast, severely, thoroughly) |
| steadily(adverb, firm, firmly, definitely, resolutely) |
| invariably(adverb, steadily, stably) |
| persistently(adverb, tenaciously, stably) |
| staunchly(adverb, tenaciously) |
| determinedly(adverb, tenaciously) |
| fast(adjective, adverb, close, firm, intensely) |
| hard(adverb, firm, fast, severely, thoroughly) |
| permanently(adverb, stably) |
| regularly(adverb, steadily) |
| solidly(adverb, hard, firm, fast, severely) |
| durably(adverb, definitely, resolutely, stably, inflexibly) |
| earnestly(adverb, fast, intensely, fiercely, violently) |
| immovably(adverb, stably) |
| intently |