1. [adjective] (of an object) Rigid, hard to bend, inflexible.
2. [adjective] (figurative) (of policies and rules and their application and enforcement) Inflexible; rigid.
3. [adjective] (of a person) Formal in behavior; unrelaxed.
4. [adjective] (colloquial) Harsh, severe.
5. [adjective] (of muscles or parts of the body) Painful as a result of excessive or unaccustomed exercise.
6. [adjective] Potent.
7. [adjective] Dead, deceased.
8. [adjective] (of a penis) Erect.
9. [adjective] (culinary) (of whipping cream or egg whites) Beaten until so aerated that they stand up straight on their own.
10. [noun] An average person, usually male, of no particular distinction, skill, or education, often a working stiff or lucky stiff.
11. [noun] A person who is deceived, as a mark or pigeon in a swindle.
12. [noun] (slang) A cadaver, a dead person.
13. [noun] (US) A person who leaves (especially a restaurant) without paying the bill.
14. [noun] (blackjack) Any hard hand where it is possible to exceed 21 by drawing an additional card.
15. [verb] To fail to pay that which one owes (implicitly or explicitly) to another, especially by departing hastily.
16. [noun] An ordinary man; 'a lucky stiff'; 'a working stiff'.
17. [noun] The dead body of a human being; 'the cadaver was intended for dissection'; 'the end of the police search was the discovery of a corpse'; 'the murderer confessed that he threw the stiff in the river'; 'honor comes to bless the turf that wraps their clay'.
18. [adverb] Extremely; 'bored stiff'; 'frightened stiff'.
19. [adverb] In a stiff manner; 'his hands lay stiffly'.
20. [adjective] Not moving or operating freely; 'a stiff hinge'.
21. [adjective] Powerful; 'a stiff current'; 'a stiff breeze'.
22. [adjective] Rigidly formal; 'a starchy manner'; 'the letter was stiff and formal'; 'his prose has a buckram quality'.
23. [adjective] Having a strong physiological or chemical effect; 'a potent toxin'; 'potent liquor'; 'a potent cup of tea', 'a stiff drink'.
24. [adjective] Marked by firm determination or resolution; not shakable; 'firm convictions'; 'a firm mouth'; 'steadfast resolve'; 'a man of unbendable perseverence'; 'unwavering loyalty'.
25. [adjective] Incapable of or resistant to bending; 'a rigid strip of metal'; 'a table made of rigid plastic'; 'a palace guardsman stiff as a poker'; 'stiff hair'; 'a stiff neck'.
26. [adjective] Very drunk.