1. 形容詞
   更困難的, 更艱難的
   更費力的, 更辛苦的
   更硬的, 更硬質的
   更堅固的
   更難受的
   (氣候)更酷寒的
   更猛力的
   更刻苦的, 更努力的
   毒性更強的
   更確實的, 更不容懷疑的
   

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   同義字詞
   callous,case-hardened,cold-blooded,compassionless,desensitized,hard-boiled,hard-hearted,heartless,indurate,inhuman,inhumane,insensate,insensitive,ironhearted,merciless,obdurate,pitiless,remorseless,ruthless,soulless,stony,stoney,take-no-prisoners,thick-skinned,uncharitable,unfeeling,unmerciful,unsparing,unsympathetic
   arduous,Augean,backbreaking,challenging,demanding,difficult,effortful,exacting,formidable,grueling,gruelling,heavy,herculean,killer,laborious,moiling,murderous,rigorous,rough,rugged,severe,stiff,strenuous,sweaty,tall,testing,toilsome,tough,uphill
   cast-iron,hard-bitten,hardened,hardy,inured,rugged,stout,strong,sturdy,tough,toughened,vigorous
   commonsense,commonsensible,commonsensical,firm,good,informed,just,justified,levelheaded,logical,rational,reasonable,reasoned,sensible,sober,solid,valid,well-founded
   bitter,brutal,burdensome,cruel,excruciating,grievous,grim,harsh,heavy,inhuman,murderous,onerous,oppressive,rough,rugged,searing,severe,stiff,tough,trying
   acute,almighty,blistering,deep,dreadful,excruciating,explosive,exquisite,fearful,fearsome,ferocious,fierce,frightful,furious,ghastly,heavy,heavy-duty,intense,intensive,keen,profound,terrible,vehement,vicious,violent
   austere,authoritarian,flinty,harsh,heavy-handed,ramrod,rigid,rigorous,severe,stern,strict,tough
   compact,firm,rigid,solid,stiff,unyielding
   certain,determinate,final,firm,fixed,flat,frozen,hard-and-fast,inexpugnable,set,settled,stable
   acrid,acrimonious,bitter,embittered,rancorous,resentful,sore
   adamant,bullheaded,dogged,hard-nosed,hardened,hardheaded,headstrong,immovable,implacable,inconvincible,inflexible,intransigent,mulish,obdurate,obstinate,opinionated,ossified,pat,pertinacious,perverse,pigheaded,self-opinionated,self-willed,stubborn,unbending,uncompromising,unrelenting,unyielding,willful,wilful
   documentary,factual,historical,literal,matter-of-fact,nonfictional,objective,true
   

例句

1. Let's make it harder .
2. In future she is going to be harder .
3. This game gets harder as you go along.
4. The sneaky part is harder than it sounds.
5. They try harder and make a better product.
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