Machiavellian :: crafty; double-dealing

magnanimous :: generous

magniloquent :: boastful; pompous

malevolent :: wishing evil

malicious :: dictated by hatred or spite

malignant :: having an evil influence; virulent

malleable :: capable of being shaped by pounding

mammoth :: gigantic

mandatory :: obligatory

maniacal :: raving mad

manifest :: understandable; clear

marital :: pertaining to marriage

maritime :: bordering on the sea; nautical

martial :: warlike

maternal :: motherly

maudlin :: effusively sentimental

mauve :: pale purple

meddlesome :: interfering

mediocre :: ordinary; commonplace

mellifluous :: flowing smoothly; smooth

mendacious :: lying; false

menial :: suitable for servants; low

mercantile :: concerning trade

mercenary :: interested in money or gain

mercurial :: fickle; changing

meretricious :: flashy; tawdry

metallurgical :: pertaining to the art of removing metals from ores