How do you pronounce "insidious"?

In American English: /ˌɪnˈsɪˌdiːəs/ (in-SI-dee-uhs). In British English: /ɪnsˈɪdɪəs/ (ins-ID-i-uhs). In Canadian English: /ˌɪnˈsɪˌdiːəs/ (in-SI-dee-uhs). In Australian English: /ɪnsˈɪdiəs/ (ins-ID-ee-uhs).

Is "insidious" pronounced differently in American and British English?

Yes. In American English it's pronounced /ˌɪnˈsɪˌdiːəs/ (in-SI-dee-uhs), while in British English it's /ɪnsˈɪdɪəs/ (ins-ID-i-uhs).

How to Pronounce "insidious"

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insidious

regional

/ˌɪnˈsɪˌdiːəs/

in-SI-dee-uhs

Syllable Breakdown

ɪnin·sɪsid·diːi·əsous

Source

90%confidence📘 CMU Pronouncing Dictionary v0.7b

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Last updated: 2026-02-14