Definitions:

1. Doubtful or uncertain; not to be relied on. ADJECTIVE
   • She gave him a dubious look after hearing his unlikely story.
2. Feeling or showing hesitation or suspicion. ADJECTIVE
   • I'm dubious about investing in something with no track record.
3. Questionable in terms of truth, quality, or morality. ADJECTIVE
   • The company made a dubious claim about the effectiveness of its product.

Synonyms:

• doubtful
• questionable
• skeptical
• suspicious
• untrustworthy

NearBy Words:

• dubiously
• dubiousness