Machiavellian
Deceitful; tricky
Macabre
Horrible; gruesome
Machination
Evil design
Maelstrom
Whirlpool
Magnanimous
Generous
Magnate
Important person in any field
Maim
To cripple; to deprive of the use of some part of the body
Maladroit
Clumsy; unskillful; awkward
Malady
Disease; illness
Malaise
Discomfort; uneasiness
Malapropism
Word humorously misused
Malcontent
One who is dissatisfied
Malediction
Curse
Malefactor
Wrongdoer; villain
Malfeasance
Wrongdoing
Malign
To speak badly of
Malingerer
One who pretends to be sick to avoid work
Malodorous
Bad-smelling; stinking
Mammoth
Huge; enormous
Manacle
Handcuff; restraint
Mangle
To cut, slash, or crush as to disfigure
Mangy
Shabby; filthy
Manifest
Evident; obvious
Manifold
Many; varied