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

Of course, trades that may look suspicious could be the wagers of a sharp speculator or an enthusiastic backer. — Melissa Lee,paige Tortorelli, CNBC, 30 Oct. 2026

The markets also overrated Netanyahu’s challenger in Israel, where the race is still too close to call — and where a series of suspicious bets elicited an investigation by Polymarket. — Liz Hoffman, semafor.com, 30 Oct. 2026

How the monitoring system works OpenAI uses four monitoring layers to identify suspicious behavior and determine whether intervention is necessary. — Aamir Khollam, Interesting Engineering, 29 Oct. 2026

At the same time, police also noted suspicious behavior from McDermitt — including him mourning Fox’s death on Facebook. — Caroline Blair, PEOPLE, 29 Oct. 2026