| groggy(adjective, calm, dull, flat, unemotional) |
| hardboiled(factual, unembellished, stoic) |
| hardened(adjective, blank, unemotional, emotionless, expressionless) |
| hardheaded(rational, straightforward, down-to-earth) |
| harsh(adjective, severe, sharp, serious, stern) |
| hidden(unfathomable, enigmatic, sphinx-like) |
| ho hum(expression, adjective, ironic, understated, laconic) |
| humorless |
| humorous(adjective, sharp, ironic, understated, sarcastic) |
| impassiveness |
| impassivity(noun, mask) |
| impenetrable(unfathomable, enigmatic, sphinx-like) |
| incomprehensible(unfathomable, enigmatic, sphinx-like) |
| indecipherable(unfathomable, enigmatic, sphinx-like) |
| indurated(adjective, blank, unemotional, emotionless, expressionless) |
| inelaborate(adjective, ironic, understated, laconic, wry) |
| inexcitable(adjective, blank, unemotional, emotionless, expressionless) |
| inexplicable(unfathomable, enigmatic, sphinx-like) |
| inscrutability(noun, mask) |
| insensible(adjective, blank, unemotional, emotionless, expressionless) |