| unmerciful(adjective, mean, severe, harsh, cruel) |
| unpermissive(adjective, tough, severe, firm, harsh) |
| unpitying(adjective, mean, severe, harsh, cruel) |
| unremitting(adjective, persistent, constant, pitiless, unyielding) |
| unsparing(adjective, mean, tough, severe, firm) |
| unwavering(adjective, persistent, constant, pitiless, unyielding) |
| unyielding(adjective, mean, severe, harsh, cruel) |
| uptight(adjective, tough, severe, firm, harsh) |
| valid(adjective, severe, harsh, stiff, rigid) |
| wanton(adjective, mean, severe, harsh, cruel) |
| autocratic |
| dog eat dog(expression, adjective, idiom, mean, severe) |
| forceful(adjective, severe, stiff, tight, strict) |
| hard-hearted(adjective, prearranged, dogged, ironfisted, unabated) |
| hard-nosed(adjective, severe, harsh, stiff, rigid) |
| hardboiled(adjective, prearranged, scrupulous, dogged, ironfisted) |
| ironfisted(adjective, dogged, disciplined, structured, unsparing) |
| scrupulous(adjective, tough, severe, firm, harsh) |
| strait-laced(adjective, tough, severe, firm, harsh) |
| stuffy(adjective, tough, severe, firm, harsh) |