| scrutinizingly(adverb, attentively) |
| seriously(vigorously, earnestly, actively, hastily, carefully) |
| sleeplessly |
| solicitously(adverb, severely, thoroughly, fully, precisely) |
| speedily(vigorously, earnestly, actively, hastily, carefully) |
| spiritedly(vigorously, earnestly, actively, hastily, carefully) |
| strenuously(vigorously, earnestly, actively, hastily, carefully) |
| strictly |
| studiously(vigorously, earnestly, actively, hastily, carefully) |
| suspiciously |
| trustily(severely, thoroughly, fully, precisely, correctly) |
| unremittingly(vigorously, earnestly, actively, hastily, carefully) |
| unweariedly(vigorously, earnestly, actively, hastily, carefully) |
| uprightly(severely, thoroughly, fully, precisely, correctly) |
| vigorously(earnestly, actively, hastily, carefully, eagerly) |
| vivaciously(vigorously, earnestly, actively, hastily, carefully) |
| with forethought(expression, severely, thoroughly, fully, precisely) |
| with reservations(expression, severely, thoroughly, fully, precisely) |
| zealously(adverb, vigorously, earnestly, actively, hastily) |
| apprehensively |