What does dubious mean?
Dubious is an adjective describing something that provokes doubt — a claim, source, plan, or person whose truthfulness, quality, or reliability is open to question. A 'dubious excuse' is one you suspect is false; a person of 'dubious reputation' has a history that makes trust difficult; someone who is 'dubious about' an idea feels hesitant or unconvinced by it. The word occupies a middle ground between outright disbelief and confident acceptance, which makes it especially useful in measured criticism: journalists, reviewers, and analysts reach for it constantly when they want to signal scepticism without making a flat accusation. Its connotations are mildly to strongly negative depending on context — describing evidence as dubious questions its validity, while calling someone's dealings dubious hints at possible dishonesty. Derived from Latin dubius, meaning 'doubtful' or 'wavering between two things', it entered English in the early seventeenth century and remains a staple of both formal writing and ordinary conversation wherever uncertainty needs a precise, dignified name.
adjectiveHesitating or doubting; not to be relied upon or trusted. Also, of questionable value, honesty, or authenticity.
- Regarded with doubt or suspicion; unlikely to be true, genuine, or reliable.
- Of uncertain or questionable quality, morality, or merit.
- (Of a person) hesitant or undecided about something.
"She cast a dubious glance at the stranger's too-perfect credentials."
"The company's dubious accounting practices eventually attracted the attention of regulators."
"He was dubious about whether the plan would survive contact with reality."
Dubious comes from the Latin dubius — the same root behind 'double' and 'doubt', capturing that split-second hesitation between two choices.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of dubious
Dubious derives from the Latin dubius, meaning 'doubtful' or literally 'wavering between two alternatives', from dubare, 'to hesitate'. It passed into English in the early seventeenth century, likely via French or directly from scholarly Latin. It shares this Latin root with related English words such as dubiety, indubitable, and doubt itself.
Related word forms
How dubious is actually used
Neutral to formal register; common in journalism and everyday speech. When applied to people ('a dubious character'), it carries strong negative connotation suggesting untrustworthiness; when applied to ideas or claims, it can be more neutral, simply indicating uncertainty.
Easily confused with dubious
Dubiety is the noun form meaning doubt or uncertainty itself, whereas dubious is the adjective describing something doubtful or suspect.
Devious means dishonest or deceitful in a scheming way, while dubious means merely doubtful, uncertain, or untrustworthy.