| rigourous |
| ruthless(adjective, appearance, mean, strong, hard) |
| simon-pure(adjective, pure) |
| sour(adjective, severe, bleak, ugly, gray) |
| standoffish(adjective, strong, cold, shy, unfriendly) |
| steely(adjective, strong, hard, tough, severe) |
| stiff-necked(adjective, strong, hard, tough, severe) |
| stoical |
| stony(adjective, mean, hard, harsh, cold) |
| thrifty(adjective, stingy, economical) |
| tyrannical(adjective, severity) |
| unadulterated(adjective, simple, clean, plain, pure) |
| ungentle |
| unornamented(adjective, hard, simple, severe, clean) |
| unpretentious(adjective, simple, clean, plain, pure) |
| unsympathetic(adjective, hard, tough, severe, harsh) |
| vanilla(adjective, simple, clean, plain, pure) |
| virtuous(adjective, quiet, simple, pure, innocent) |
| absolute(adjective, simple, clean, plain, pure) |
| antisocial(adjective, company, nonparticipating) |