| steely(adjective, strong, hard, tough, severe) |
| true-blue(adjective, close, correct, firm, honest) |
| unbending(adjective, strong, hard, tough, firm) |
| ungiving(adjective, firm, unyielding) |
| unrelenting(adjective, strong, hard, tough, severe) |
| warrior(noun, hector) |
| wicked(noun, coarse, vulgar, indecent, naughty) |
| X-rated(adjective, offensive, dirty, coarse, vulgar) |
| affectionate(adjective, close, correct, firm, honest) |
| allegiant(adjective, close, correct, firm, honest) |
| astringent(adjective, strong, hard, tough, severe) |
| attached(adjective, close, correct, firm, honest) |
| austere(adjective, strong, hard, tough, severe) |
| authoritarian(adjective, strong, hard, tough, severe) |
| behind one(expression, adjective, close, correct, firm) |
| bitter(adjective, strong, hard, tough, severe) |
| bullheaded(adjective, strong, hard, tough, severe) |
| by the book(expression, adjective, idiom, strong, hard) |
| cast-iron |
| ceaseless |