How many syllables in insidious?

There are 4 syllables in the word insidious.

Divide insidious into syllables:

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

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Here are some other common words that have 4 syllables, like insidious does.

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How many syllables in the word imperious?

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