- mace
- maelstrom
- maid
- mail shirt
- mainsail
- make a beeline
- make yourself scarce
- makeover
- malevolent
- malevolently
- malfunctioned
- malice
- malicious
- manage to
- manageable
- maneuverability
- mangroves
- manic
- manners
- mansion
- mantel
- manure
- marathon
- mare
- marketing
- maroon
- mascot
- mastermind
- masticate
- matches
- materialized
- matron
- matter-of-factly
- mauled
- mausoleum
- maw
- maze
- measuring cup
- measuring spoons
- medal
- meek
- meekly
- menace
- menaces
- menagerie
- mending
- mention
- mentor
- merchandise
- merchant
- merciless
- mere
- merit
- mesh
- metal detector
- methodical
- methodically
- meticulous
- metropolis
- microphone
- midair
- midget
- midsection
- miffed
- mildew
- militia
- mill around
- milling around
- miming
- mind your tongue
- mind-boggling
- miniature
- minimart
- minimized
- minstrels
- misbehavior
- mischievous
- misery
- mismatch
- misshapen
- missing the point
- misty
- mixed feelings
- moan
- mob
- mobile
- mock
- mole
- momentum
- monetary
- mongoose
- monitored
- monopoly
- montage
- monumental
- moose
- mope
- moping
- morph
- morphed
- morsel
- mortal
- mosaic
- mother-in-law
- motionless
- motive
- mound
- mount
- muffled
- mugger
- mull over
- mullet
- mulling
- multiple
- mumble
- mummy
- munched
- mundane
- murky
- murmur
- mushy
- mustache
- muster
- mutant
- mutter
- muzzle
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| the person who thought of some big plan, project or idea, mostly used for an evil genius, (a smart person who does bad things) |