<p><strong>Adjective</strong></p><ul><li>stiffer, stiffest</li><li>rigid or firm; difficult or impossible to bend or flex: a stiff collar.</li><li>not moving or working easily: The motor was a little stiff from the cold weather.</li><li>(of a person or animal) not supple; moving with difficulty, as from cold, age, exhaustion, or injury.</li><li>strong; forceful; powerful: The fighter threw a stiff right to his opponent's jaw.</li><li>strong or potent to the taste or system, as a beverage or medicine: He was cold and wanted a good stiff drink.</li><li>resolute; firm in purpose; unyielding; stubborn.</li><li>stubbornly continued: a stiff battle.</li><li>firm against any tendency to decrease, as stock-market prices.</li><li>rigidly formal; cold and unfriendly, as people, manners, or proceedings.</li><li>lacking ease and grace; awkward: a stiff style of writing.</li><li>excessively regular or formal, as a design; not graceful in form or arrangement.</li><li>laborious or difficult, as a task.</li><li>severe or harsh, as a penalty or demand.</li><li>excessive; unusually high or great: $50 is pretty stiff to pay for that.</li><li>firm from tension; taut: to keep a stiff rein.</li><li>relatively firm in consistency, as semisolid matter; thick: a stiff jelly; a stiff batter.</li><li>dense or compact; not friable: stiff soil.</li><li>(of a vessel) having a high resistance to rolling; stable.</li><li>sturdy, stout, or strongly built.</li><li>out of luck; unfortunate.</li></ul><p><strong>Noun (Slang)</strong></p><ul><li>a dead body; corpse.</li><li>a formal or priggish person.</li><li>a poor tipper; tightwad.</li><li>a drunk.</li><li>a fellow: lucky stiff; poor stiff.</li><li>a tramp; hobo.</li><li>a laborer.</li><li>a forged check.</li><li>a promissory note or bill of exchange.</li><li>a letter or note, especially if secret or smuggled.</li><li>a contestant, especially a racehorse, sure to lose.</li></ul><p><strong>Adverb</strong></p><ul><li>in or to a firm or rigid state: The wet shirt was frozen stiff.</li><li>completely, intensely, or extremely: We're scared stiff. I'm bored stiff by these lectures.</li></ul><p><strong>Verb (used with object) (Slang)</strong></p><ul><li>to fail or refuse to tip (a waiter, porter, etc.).</li><li>to cheat; swindle; do out of: The company stiffed me out of a week's pay.</li></ul>