| productive(adjective, work, strain, firmness, labour) |
| stubborn |
| unwearied(adjective, activity, tireless) |
| unwearying |
| aggressive(adjective, strong, keen, intense, energetic) |
| fervent(adjective, strong, passionate, vigorous, ardent) |
| pertinacious(adjective, perseverance) |
| resolute(adjective, keen, intense, energetic, lively) |
| animated(adjective, strong, moving, keen, intense) |
| burning(adjective, vigorous, hardworking) |
| bustling(adjective, moving, keen, intense, energetic) |
| determined(adjective, keen, intense, energetic, enthusiastic) |
| hard |
| punctilious(adjective, thorough, meticulous, painstaking) |
| purposeful(adjective, strong, keen, intense, energetic) |
| sprightly(adjective, strong, keen, intense, energetic) |
| steadfast(adjective, energetic, determined, active, vigorous) |
| thorough(adjective, careful, regular, serious, competent) |
| thoroughgoing(adjective, thorough, meticulous, painstaking) |
| unwavering |