| compelling(adjective, severe, harsh, stiff, rigid) |
| confining(adjective, severe, harsh, stiff, rigid) |
| constant(adjective, persistent, pitiless, unyielding, endless) |
| continual(adjective, persistent, constant, pitiless, unyielding) |
| continuous(adjective, persistent, constant, pitiless, unyielding) |
| convincing(adjective, severe, harsh, stiff, rigid) |
| cruel(adjective, mean, severe, harsh, constant) |
| cutthroat(adjective, mean, severe, harsh, cruel) |
| dead set(expression, adjective, tough, severe, firm) |
| dead set on(expression, adjective, idiom, severe, stiff) |
| demanding(adjective, severe, harsh, stiff, rigid) |
| disciplinary(adjective, tough, severe, firm, harsh) |
| dog-eat-dog(adjective, mean, severe, harsh, cruel) |
| dour(adjective, tough, severe, firm, harsh) |
| draconian(adjective, tough, severe, firm, harsh) |
| drawing(adjective, severe, harsh, stiff, rigid) |
| dyed-in-the-wool(adjective, severe, harsh, stiff, rigid) |
| endless(adjective, persistent, constant, pitiless, unyielding) |
| exacting(adjective, tough, severe, firm, harsh) |
| fierce(adjective, mean, severe, harsh, cruel) |