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bloodless + [noun]
常修饰政变、革命、交接等名词，表示没有动用暴力或造成流血。
The new leader came to power in a bloodless coup.
新领导人在一场不流血的政变中掌权。
不流血的；不动干戈的
先理解核心含义，再看它在真实句子里的用法。
不流血的；不动干戈的
without bloodshed; not involving killing or violence
The new leader came to power in a bloodless coup.
新领导人在一场不流血的政变中掌权。
缺乏血液的；苍白的,贫血的。
Lacking blood; ashen, anaemic.
没有流血的。
Taking place without loss of blood.
缺乏情感、热情或活力的。
Lacking emotion, passion or vivacity.
The new laser technique makes surgery nearly bloodless, and patients recover faster.
新的激光技术让手术几乎不出血，病人恢复得更快。
When she heard the news, her face turned bloodless with shock.
听到消息时，她震惊得脸都白了，毫无血色。
The team's bloodless performance disappointed the fans, who expected more passion.
球队毫无生气的表现让球迷失望，他们本来期待更多热情。
常修饰政变、革命、交接等名词，表示没有动用暴力或造成流血。
The new leader came to power in a bloodless coup.
新领导人在一场不流血的政变中掌权。
look 是系动词，后接形容词作表语，表示“看起来显得…”。
Her face looked bloodless in the moonlight.
月光下她的脸色看起来苍白无血色。
此结构表示“认为某事物缺乏活力或生气”，find 后接宾语和形容词补足语。
Many viewers found the film bloodless and dull.
许多观众觉得这部电影平淡无生气。
Not this
The operation was no blood.
Use this
The operation was bloodless.
受汉语“没有血/不流血”影响，学习者常把“no + 名词”放在 be 后作表语；但英语里表示“不流血的”这一性质要用形容词 bloodless，名词短语 no blood 不能作这种表语。
Not this
The second coup was bloodlesser than the first.
Use this
The second coup was more bloodless than the first.
bloodless 是双音节形容词，比较级应加 more 构成 more bloodless，不能按单音节形容词规则直接加 -er 变成 bloodlesser。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
不流血的政变
The army staged a bloodless coup and removed the president from power.
军队发动了一场不流血的政变，将总统赶下了台。
无输血手术
Many patients request bloodless surgery because of their religious beliefs.
许多病人因宗教信仰要求做无输血手术。
苍白的脸；面无血色
She turned to us with a bloodless face after hearing the news.
听到消息后，她转过脸来，面无血色。
毫无生气的表演
The actor gave a bloodless performance that bored the audience.
那位演员的表演毫无生气，让观众感到无聊。
平淡无味的文章；毫无生气的文字
The novel's bloodless prose failed to move any reader.
这部小说平淡无味的文字没能打动任何读者。
不流血的政变
The army staged a bloodless coup and took control of the government overnight.
军队发动了一场不流血的政变，一夜之间控制了政府。
不流血革命
The country underwent a bloodless revolution that brought democratic reforms peacefully.
这个国家经历了一场不流血革命，和平带来了民主改革。
不流血的胜利
The negotiations resulted in a bloodless victory for the workers' union.
谈判为工会赢得了一场不流血的胜利。
Use bloodless naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
想象blood（血）加上less（无）：没有血，战斗不流血，脸色也苍白没血色。
语域：neutral 常见场景：political transitions、military operations、news coverage 这里指“不流血的、不动干戈的”。该用法多出现在新闻报道、历史叙述或正式讨论中，属于中性偏书面；日常口语中如果说到类似意思，也常说 peaceful 或 without violence。
None of the -less words rhymes with bloodless: their stressed vowels differ. Flood is a useful lookalike for the 'oo' = /ʌ/ spelling in blood, the base of bloodless, but it is not a rhyme.
Dictionary facts from ECDICT, WIKTIONARY.