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The pronunciation of any word in English (or any language at all) is not Universal.  This is because there are many different dialects of The English Language — both throughout America, and also world-wide.  The pronunciations that are presented on GiveMeSomeEnglish!!! are based-upon a combination of both “common usage”, and the most neutral accent used in The International Common Tongue — a.k.a. “American English”.
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Advantageous – For this word:  the “A” is short;  the “d” is a flap-d but is (often) stopped;  the second “a” is short;  the third “a” is a Long “A” / Long “E” Diphtong;  the “g” is soft;  and for the “eou” combination turns into an i-schwa.

– /æ[d]-væn-TAY-dʒihs/ – /æ[d].væn.ˈteiː.dʒə(ɪ)s/ – Notice also that the stress is on the third syllable –

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See Also:  Advantage & Advantages

Learn More About The Word “Advantageous” On Wiktionary

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