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

Consider freezing your credit and monitoring your accounts and credit reports for suspicious activity. — Roxanne Downer, USA Today, 11 Sep. 2026

Chandra spotted 84 suspicious object emitting very low-energy X-rays in six galaxies – four evolved ellipticals and two spirals, namely our near-neighbor the Andromeda Galaxy (M31) and the Pinwheel Galaxy (M101). — Keith Cooper, Space.com, 11 Sep. 2026

Defending against al-Qaeda required officials to identify suspicious people, trace money and travel, map personal networks, and act before an attack occurred. — Daniel Benjamin, Foreign Affairs, 11 Sep. 2026

Then last November, the house was damaged in a highly suspicious fire. — Jc Reindl, Freep.com, 11 Sep. 2026