How to pronounce mysterious

mys·TE·ri·ous

"mysterious" has 4 syllables. The stress is on the second syllable: TE.

Sounds like

mih-STIR-ee-uhs

IPA (American)

/mɪˈstɪriəs/

Rhythm

da-DAAA-da-da

Words ending in -ious put the stress right before the ending. The same rule works for many other words.