1
it is unjustifiable to do sth
该句型用 it 作形式主语，真正的主语是不定式短语。
It is unjustifiable to spend so much money on luxury items while others starve.
在别人挨饿的时候花这么多钱买奢侈品是不合理的。
不合理的；无法辩护的；不能证明为正当的
先理解核心含义，再看它在真实句子里的用法。
不合理的；无法辩护的；不能证明为正当的
incapable of being justified or explained
It is unjustifiable to spend so much money on luxury items while others starve.
在别人挨饿的时候花这么多钱买奢侈品是不合理的。
无法证明、辩解或原谅的
That cannot be justified, excused or pardoned.
It is unjustifiable to throw away perfectly good food.
把完全还能吃的食物扔掉是不合理的。
The loud music at two in the morning was an unjustifiable disturbance.
凌晨两点还在大声放音乐是一种没有道理的扰民行为。
Charging customers double for a simple repair seems unjustifiable to me.
在我看来，一个简单的维修却向顾客收双倍费用，似乎说不过去。
该句型用 it 作形式主语，真正的主语是不定式短语。
It is unjustifiable to spend so much money on luxury items while others starve.
在别人挨饿的时候花这么多钱买奢侈品是不合理的。
find + 宾语 + 形容词作宾补，表示“认为……不合理/无法辩解”。可用 absolutely 等加强语气。
I find his rude behavior absolutely unjustifiable.
我觉得他粗鲁的行为完全不可原谅。
be unjustifiable 后常接 to sb 说明评价者，也可接 on grounds 等说明理由。
The cost of the new stadium seems unjustifiable to many taxpayers.
新体育场的费用在许多纳税人看来似乎不合理。
作定语修饰名词，常与 use, action, behavior, waste 等搭配。
They condemned the unjustifiable use of force against civilians.
他们谴责了针对平民的不正当使用武力的行为。
Not this
He unjustifiable ignored my advice.
Use this
He unjustifiably ignored my advice.
修饰动词 ignored 应用副词 unjustifiably；unjustifiable 是形容词，只能修饰名词或作表语。unjustifiably 意为‘毫无道理地、不可辩护地’，与句意‘不理会忠告’相符。
Not this
The teacher's criticism was unjustifiable because she never explained her reasons.
Use this
The teacher's criticism was unjustified because she never explained her reasons.
unjustifiable 意为‘无法证明为正当的’，指事物本身不可能有理由；unjustified 意为‘未被证明为正当的、没有理由的’，指实际未给出理由。句中只是说没有解释理由，应用 unjustified。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
不合理的开支
The committee rejected the proposal as an unjustifiable expense.
委员会以不合理的开支为由否决了该提案。
不合理的延误
The project suffered an unjustifiable delay.
该项目遭遇了一次不合理的延误。
不合理的风险
Taking on that much debt for a luxury purchase is an unjustifiable risk.
为一件奢侈品背负这么多债务是一种不合理的风险。
毫无道理的暴力行为
The court condemned the police officer's actions as unjustifiable violence.
法院谴责该警察的行为是毫无道理的暴力行为。
不合理的干涉
The treaty prohibits unjustifiable interference in the domestic matters of other states.
该条约禁止对他国内政进行不合理的干涉。
完全没有道理的
The decision to cancel the program at the last minute was wholly unjustifiable.
在最后一刻取消该项目的决定完全没有道理。
Use unjustifiable naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 unjustifiable 拆成 un（不）+ justifiable（有正当理由的），联想“连一个正当理由都找不到”，就是“不合理的、无法辩解的”。双“i”像眼睛，盯着看也找不出借口。
语域：formal 常见场景：formal writing、academic text、legal argument unjustifiable 多用于正式或书面语境，如学术、法律或辩论性文本，日常口语中较少用，此时更常说 unreasonable 或 inexcusable。
Only justifiable is a true rhyme: its stressed vowel and following sounds match the target. The other words share the spelling ending -ifiable and the same unstressed final /faɪəbəl/, but their main stress falls on an earlier syllable, so they sound different and should not be treated as rhymes.
Dictionary facts from ECDICT, WIKTIONARY.