unreliable

/ˌənɹiˈɫaɪəbəɫ/, /ˌənɹɪˈɫaɪəbəɫ/ adj A2, B2

**Unreliable** describes anything or anyone that fails to perform consistently, leaving expectations unmet and plans in jeopardy. It signals a lack of dependability that can be frustratingly predictable. Beyond a simple trait, the term applies to devices that sputter, data that wavers, and forecasts that miss the mark. A person labeled **unreliable** might forget appointments, break promises, or shift priorities without warning. In technical contexts, an unreliable network drops packets, while an unreliable witness changes their story. The word carries a hint of disappointment, urging caution when placing trust in whatever bears its label.

【核心含义】指人或事物无法稳定发挥作用,常导致期望落空或计划受阻。

多用于形容反复失信的个人(如爽约者)、性能不稳定的设备,或波动较大的数据。注意与"不靠谱"口语化用法区分。

【Significado central】Algo o alguien que no funciona de manera constante y en quien no se puede confiar para que cumpla lo prometido.

Se aplica a personas que olvidan compromisos, rompen promesas o cambian de prioridades sin aviso (un amigo poco confiable, un testigo poco confiable), a objetos que fallan seguido (un auto poco confiable en invierno) y a datos o pronósticos que no son consistentes. En contextos técnicos, una red poco confiable pierde paquetes de información. No debe confundirse con "falso" (false): algo falso es inventado o engañoso a propósito, mientras que algo poco confiable simplemente no cumple de forma constante, aunque en el fondo "quisiera" hacerlo. El término transmite decepción y sugiere desconfianza.

Word Origin Built from un- 'not' and reliable, which comes from rely, ultimately from Latin ligare 'to bind, tie.' To rely on someone is to bind yourself to them, to attach your trust. So unreliable means you can't be tied to that person — they won't hold. The root ligare gives us ligament (something that binds), ligature, league (a binding agreement), and ally (to bind to). Unreliable is literally 'un-bind-able.'

adj not dependable A2

My alarm clock is unreliable; sometimes it doesn't ring.

(形容词) 不可靠的;靠不住的

我的闹钟不可靠,有时它不响。

(adjetivo) poco fiable; no confiable; informal [que no es de fiar]

Mi despertador no es confiable; a veces no suena.

(adjectif) peu fiable; peu sûr; sur lequel on ne peut pas compter; sujet à caution [Sur qui on ne peut pas compter en raison de son manque de régularité ou de sérieux.]

Mon réveil n'est pas fiable ; parfois il ne sonne pas.

(Adjektiv) unzuverlässig [nicht zuverlässig oder vertrauenswürdig; unberechenbar in der Erfüllung von Pflichten]

Mein Wecker ist **unreliable**; manchmal klingelt er nicht.

(形容詞) 信頼できない、当てにならない

私の目覚まし時計は当てにならない;時々鳴らないことがある。

(adjetivo) não confiável; inseguro; duvidoso [não confiável; que não se pode confiar]

Meu despertador não é confiável; às vezes ele não toca.

adj Not reliable. B2 ✓

The old car is unreliable in winter weather.

(形容词) 不可靠的;靠不住的

这辆旧车在冬季天气里不可靠。

(adjetivo) poco fiable; poco confiable; informal; no fiable [No confiable.]

El auto viejo no es confiable en el clima invernal.

(adjectif) peu fiable; non fiable; pas fiable; peu sûr; irrégulier [Sur qui ou sur quoi on ne peut pas compter.]

La vieille voiture est unreliable en hiver.

(Adjektiv) unzuverlässig; unbeständig; unberechenbar [Nicht vertrauenswürdig; nicht zuverlässig in Funktion oder Verhalten.]

Das alte Auto ist bei winterlichem Wetter **unreliable**.

(形容詞) 信頼できない。頼りにすることができない。

古い車は冬の天候では当てにならない。

(adjetivo) não confiável; imprevisível; inseguro [Não confiável.]

O carro velho é pouco confiável no clima de inverno.

noun One who or that which cannot be relied upon. B2 ✓ countable

He proved to be an unreliable when we needed him most.

(名词) 不可靠的人;不靠谱的人;靠不住的人 【不可靠的人或事物】

在我们最需要他的时候,他证明了自己是个靠不住的人。

(sustantivo) persona poco fiable; persona de poca confianza; informal [Aquel o aquello que no se puede confiar.]

Resultó ser un inconfiable cuando más lo necesitábamos.

(nom) personne peu fiable; individu sur qui on ne peut pas compter; irrégulier [Personne ou chose sur qui on ne peut pas se fier.]

Il s'est révélé être un unreliable quand on avait le plus besoin de lui.

(Substantiv) unzuverlässige Person; unzuverlässiger Mensch [Jemand oder etwas, auf das man sich nicht verlassen kann.]

Er erwies sich als **unreliable**, als wir ihn am meisten brauchten.

(名詞) 信頼できない人、または頼りにすることができないもの。

彼が最も必要としていた時に、彼は信頼できない人物だと証明された。

(substantivo) pessoa não confiável; indivíduo não confiável [Aquele ou aquilo em que não se pode confiar.]

Ele se mostrou uma pessoa não confiável justamente quando mais precisávamos dele.

Word parts: un + rely + able

Common collocations

notoriously adv prove verb data subst often adv source subst evidence subst figure subst indicator subst witness subst totally adv ally subst dismiss verb

Related words

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