| exacting(adjective, hard, tough, severe, cold) |
| ferocious(adjective, mean, evil, nasty, harsh) |
| hardhearted(adjective, cold, cruel, unfeeling, unsympathetic) |
| hostile(adjective, person, mean, feelings, ill) |
| malevolent(adjective, mean, evil, nasty, harsh) |
| niggardly |
| oppressive |
| remote(adjective, person, indifferent, feelings, detached) |
| reserved(adjective, calm, person, indifferent, feelings) |
| restrained(adjective, calm, subdued, impassive, unresponsive) |
| sadistic(adjective, mean, evil, nasty, harsh) |
| standoffish(adjective, person, indifferent, feelings, detached) |
| steely(adjective, cold, cruel, stiff, unfeeling) |
| stolid |
| undemonstrative(adjective, detached, impassive, unresponsive, laid-back) |
| unenthusiastic(adjective, calm, person, feelings, restrained) |
| unloving(adjective, person, hard, feelings, cruel) |
| unsentimental |
| unsocial(adjective, person, feelings, single, isolated) |
| unstirred(adjective, calm, restrained, unconcerned, subdued) |