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hardened + noun
hardened 作定语，表示材料已凝固或变硬。
The hardened concrete was difficult to break.
变硬的混凝土很难打碎。
变硬的；凝固的
先理解核心含义，再看它在真实句子里的用法。
变硬的；凝固的
converted to a solid, hard state (as concrete)
The hardened concrete was difficult to break.
变硬的混凝土很难打碎。
使变硬的；已硬化的。
Made physically hard.
因经历而耐受或麻木的。
Having been accustomed or desensitized to something unpleasant through exposure or experience; inured.
无情的；冷酷的。
Unfeeling; pitiless; callous.
积习难改的；根深蒂固的。
Firmly established in a behavior seen as bad; unlikely to change one's ways; inveterate.
The hardened steel is used to make strong tools.
这种硬化钢用于制造坚固的工具。
The dried lava, now hardened, covered the hillside.
干涸的熔岩现已变硬，覆盖了山坡。
She scraped the hardened wax off the floor.
她把地板上变硬的蜡刮掉了。
hardened 作定语，表示材料已凝固或变硬。
The hardened concrete was difficult to break.
变硬的混凝土很难打碎。
hardened against 表示经过特殊加固以抵御攻击或破坏。
The bunker is hardened against a nuclear blast.
这个掩体经过加固，能抵御核爆炸。
Not this
He is a very hard criminal.
Use this
He is a very hardened criminal.
表示“惯犯、不思悔改的罪犯”时，必须用固定搭配 hardened criminal；hard 作形容词指“硬的”或“困难的”，不能表示“屡教不改”。
Not this
The command center is hard against cyber attacks.
Use this
The command center is hardened against cyber attacks.
要表达“加固以抵御（攻击）”，应用 hardened against；hard against 是另一词组，意为“紧靠着”，与“防护”无关。
Not this
The test questions are hardened.
Use this
The test questions are hard.
hardened 是“变硬的、凝固的、冷酷的”，没有“困难的”之义；“困难的”应当用 hard。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
硬化混凝土
Hardened concrete can support heavy loads.
硬化混凝土能承受很重的荷载。
淬火钢
This knife is made from hardened steel.
这把刀是用淬火钢制成的。
死不悔改的罪犯
The hardened criminal showed no remorse in court.
这名死不悔改的罪犯在法庭上没有表现出任何悔意。
加固掩体
The commander ordered everyone into the hardened bunker.
指挥官命令所有人进入加固掩体。
加固目标
The missile is capable of destroying hardened targets.
这种导弹能够摧毁加固目标。
铁石心肠；冷酷的心
Years of betrayal had given him a hardened heart.
多年的背叛让他变得铁石心肠。
久经沙场的；经验丰富的
The battle-hardened soldiers remained calm under fire.
久经沙场的士兵在枪林弹雨下仍保持冷静。
对…麻木；对…习以为常
Living near the airport, residents have become hardened to the noise.
住在机场附近，居民对噪音已经习以为常。
这一次法老又硬着心，不肯让百姓离开。
The hardened criminal refused to change his ways.
这个死不悔改的罪犯拒绝改过自新。
Use hardened naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
拆分 hard（硬）+ en + ed，想想混凝土硬化后坚不可摧，也指军事上加固防攻击。
语域：mixed 常见场景：军事设施、材料与建筑 作形容词时，多用于正式或技术性场景：指物体凝固变硬（如 hardened concrete），或指设施加固、抗攻击（如 hardened target）。日常口语较少单独使用，更常见于书面说明或专业语境。
没有常见单词与 hardened（/ˈhɑːdənd/）完全押韵。happened、threatened、listened 都以 /ənd/ 结尾，但重读元音不同（/æ/、/e/、/ɪ/），只是尾音相近；garden 与 hardened 的 /ɑːdən/ 部分相同，但缺少末尾的 /d/；burdened 虽也以 /dənd/ 结尾，但元音为 /ɜː/。
Dictionary facts from ECDICT, WIKTIONARY.