| miasma | A highly unpleasant or unhealthy smell or vapor | |
| microcosm | A small, representative system having analogies to a larger system in constitution, configuration, or development | |
| milieu | A person's social environment or setting | |
| mimetic | Relating to, constituting, or habitually practicing imitation or mimicry | |
| minatory | Expressing or conveying a threat | |
| minion | A follower or underling of a powerful person, especially a servile or unimportant one | |
| miserly | Of, relating to, or characteristic of a miser; very stingy or frugal. | |
| misnomer | A wrong or inaccurate use of a name or term | |
| mitigate | To make less severe, serious, or painful | |
| monastic | Relating to monks, nuns, or others living under religious vows, or the buildings in which they live | |