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insidious
adjective
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How to pronounce insidious:

Definition of insidious:

insidious (adjective):
having a gradual and cumulative effect subtle
working or spreading in a hidden and usually injurious way.
working in a subtle or apparently harmless way, but nevertheless dangerous or deadly

Synonyms for insidious:

ambiguous
artful
artificial
beguiling
confounding
crafty
crooked
cunning
deceitful
deceiving
deceptive
deluding
delusive
delusory
designing
devious
disingenuous
distracting
duplicitous
fallacious
false
fast
foxy
fraudulent
guileful
Show 28 more

Antonyms for insidious:

above board
above-board
aboveboard
accepting
apparent
artless
as clear as day
as green as grass
as plain as a pikestaff
as plain as the nose on your face
axiomatic
bald
bald-faced
barefaced
behaved
believing
beyond doubt
beyond question
blatant
blinding
bluff
blunt
bold
bright-line
broad
Show 150 more
Other 4-syllable words

Here are some other common 4-syllable words.

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Syllable Fun Fact
Syllable-initial consonants are known to be clearer and stronger than syllable-final consonants due to articulatory strengthening.

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