| efficient(adjective, exact, careful, regular, precise) |
| exact(adjective, careful, regular, precise, neat) |
| exacting |
| exactly correct |
| finicky |
| fixed(adjective, exact, careful, regular, precise) |
| flinty(adjective, strong, hard, tough, severe) |
| forbidding(adjective, strong, hard, tough, severe) |
| framed(adjective, exact, careful, regular, neat) |
| frowning(adjective, strong, hard, tough, severe) |
| fussbudget(adjective, careful, earnest, thorough, strenuous) |
| grim(adjective, strong, hard, tough, severe) |
| habit(noun, style, rule, practice, system) |
| hang-tough(adjective, strong, hard, tough, severe) |
| hard(adjective, strong, tough, severe, harsh) |
| hard-boiled(adjective, strong, hard, tough, severe) |
| hard-core(adjective, strong, hard, tough, severe) |
| hard-line(adjective, strong, hard, tough, severe) |
| hard-nosed(adjective, strong, hard, tough, severe) |
| hard-shell(adjective, strong, hard, tough, severe) |