Synonyms of suspicious

suspicious

adjective

sə-ˈspi-shəs 

1

as in questionable

giving good reason for being doubted, questioned, or challenged

suspicious claims of being the rightful owner of the property

Synonyms & Similar Words

• questionable
• dubious
• disputable
• suspect
• doubtful
• problematic
• debatable
• fishy
• ambiguous
• shaky
• alleged
• shady
• equivocal
• queer
• unclear
• dodgy
• dubitable
• doubtable
• unlikely
• uncertain
• weak
• supposed
• improbable
• undetermined
• moot
• undecided
• so-called
• flimsy
• open
• far-fetched

Antonyms & Near Antonyms

• certain
• sure
• indisputable
• unquestionable
• unproblematic
• undeniable
• incontestable
• indubitable
• undoubted
• decisive
• obvious
• questionless
• definitive
• positive
• clear
• hands-down
• open-and-shut

2

as in skeptical

inclined to doubt or question claims

suspicious of any menu dish having a name she can't pronounce

Synonyms & Similar Words

• skeptical
• cautious
• careful
• incredulous
• wary
• questioning
• distrustful
• mistrustful
• doubting
• paranoid
• disbelieving
• negativistic
• unbelieving
• cynical
• suspecting
• show-me
• curious
• unsure
• watchful
• puzzled
• leery
• quizzical
• inquisitive
• experienced
• critical
• guarded
• uncertain
• hesitant
• unconvinced
• nosy
• worldly
• sophisticated
• undetermined
• knowing
• gun-shy
• undecided
• worldly-wise
• inquiring
• unsettled
• snoopy

Antonyms & Near Antonyms

• uncritical
• credulous
• gullible
• trusting
• trustful
• naive
• unsophisticated
• certain
• unquestioning
• innocent
• green
• positive
• simple
• sure
• confident
• ingenuous
• unknowing
• unworldly
• wide-eyed
• simpleminded
• inexperienced
• impractical
• idealistic
• raw
• childlike
• callow
• unsuspicious
• careless
• unsuspecting
• deceived
• heedless
• unwary
• duped
• tricked
• beguiled
• gulled

3

as in unsure

not feeling sure about the truth, wisdom, or trustworthiness of someone or something

you should be very suspicious of those telephone calls from people telling you that you're the winner of a contest you never entered

Synonyms & Similar Words

• unsure
• skeptical
• uncertain
• doubtful
• dubious
• unsettled
• distrustful
• mistrustful
• unconvinced
• undecided
• on the fence
• hesitant
• ambivalent
• hinky
• conflicted
• trustless
• insecure
• equivocal
• diffident
• irresolute
• indecisive
• wavering
• halting
• vacillating

Antonyms & Near Antonyms

• certain
• positive
• sure
• convinced
• confident
• assured
• sanguine
• decisive
• determined
• self-assured
• resolute

Example Sentences

Recent Examples of suspicious

The bank dropped Epstein as a client in 2013 due to human trafficking concerns, the report says, but the bank didn't report suspicious transactions to the government until six years later, shortly after Epstein's arrest. — Scott Horsley, NPR, 4 Aug. 2026

Taiwan’s Hsinchu County is implementing the Smart Eye Guardian system to automate the monitoring of public-safety events, including hazards, fires, violent activity, traffic incidents and suspicious behavior. — Lee-Lean Shu, Forbes.com, 4 Aug. 2026

Review your credit reports for signs of suspicious activity at least once every six months. — Brian Sloan, CNBC, 4 Aug. 2026

As a result, the communities with fewer resources may also have less ability to monitor suspicious activity around the clock. — Kurt Knutsson, FOXNews.com, 4 Aug. 2026