KEY: Tartness.
SYN: Sourness, sharpness, harshness, bitterness, asperity, acrimony,acerbity.
ANT: Sweetness, gentleness, kindness.

• Motive
• Motley
• Mount, [See ASCEND]
• Mournful
• Movable, [See STATIONARY]
• Move
• Movement
• {[Mrink]?}
• {[Mtwrule]?}, [See RULE]
• Much
• Mucilaginous
• Muddle
• Muddy
• Muffle
• Muggy
• Mulct
• Mulish
• Multifarious
• Multifold, [See MULTIFARIOUS]
• Multiform, [See MULTIFARIOUS]
• Multiplication
• Multisonous
• Multitude
• Multitudinous, [See MULTIFARIOUS]
• Mummery