| stiff | (adjective) having a strong physiological or chemical effect | Synonyms: potent, strong |
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| (adjective) rigidly formal | Synonyms: buckram, starchy |
| (adjective) not moving or operating freely | - |
| (adjective) very drunk | Synonyms: besotted, blind drunk, blotto, cockeyed, crocked, fuddled, loaded, pie-eyed, pissed, pixilated, plastered, slopped, sloshed, smashed, soaked, soused, sozzled, squiffy, tight, wet |
| (adjective) marked by firm determination or resolution; not shakable | Synonyms: firm, steadfast, steady, unbendable, unfaltering, unshakable, unwavering |
| (adjective) strong, vigorous | - |
| (adjective) incapable of or resistant to bending | Synonyms: rigid |
| stifled | (adjective) held in check with difficulty | Synonyms: smothered, strangled, suppressed |
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| stifling | (adjective) characterized by oppressive heat and humidity | Synonyms: sulfurous, sulphurous, sultry |
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