1. 形容詞
   最僵硬的, 最僵直的
   最硬的, 最挺的
   最不易移動的, 最不靈活的
   最拘謹的, 最生硬的
   最不自然的
   最嚴厲的
   最困難的, 最艱難的
   最費勁的
   最剛強的, 最倔強的
   最強烈的, 最猛烈的
   

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   同義字詞
   inflexible,rigid,stiffened,unyielding
   bitter,brutal,burdensome,cruel,excruciating,grievous,grim,hard,harsh,heavy,inhuman,murderous,onerous,oppressive,rough,rugged,searing,severe,tough,trying
   devilish,excessive,exorbitant,extravagant,extreme,fancy,immoderate,inordinate,insane,intolerable,lavish,overdue,overextravagant,overmuch,overweening,plethoric,steep,towering,unconscionable,undue,unmerciful
   compact,firm,hard,rigid,solid,unyielding
   awkward,clumsy,gauche,graceless,inelegant,rough-hewn,rustic,rustical,stilted,uncomfortable,uneasy,ungraceful,wooden
   arduous,Augean,backbreaking,challenging,demanding,difficult,effortful,exacting,formidable,grueling,gruelling,hard,heavy,herculean,killer,laborious,moiling,murderous,rigorous,rough,rugged,severe,strenuous,sweaty,tall,testing,toilsome,tough,uphill
   ceremonious,correct,decorous,formal,proper,punctilious,starchy,stilted
   

例句

1. It also has the stiffest consistency.
2. This is the stiffest white in the range.
3. Suffice it to say, it's the stiffest M car ever.
4. Even the stiffest of rock is not perfectly rigid.
5. The stiffest competition came in the adult male events.
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