Portuguese (Brazil) · Pronunciation Guide
ah ee-DAY-ah. Three syllables in the noun, and the d stays hard.
The weight sits on the "dei," delivered by the -a default with the diphthong counting as one syllable. Brazilian spelling dropped the old accent on this word in the 2009 reform — it used to be written "idéia," and you'll still see the older form in books printed before then.
Listen: a ideia
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Que ideia boa!
What a good idea!
Listen: Que ideia boa!
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"Que ideia boa!" uses the bare "que" exclamation with no article, the standard Portuguese pattern for "what a..." "Boa" is itself two syllables for the same reason "ideia" ends in two — an o and an a never fuse into a diphthong.
Palatalizing the d to "djay" over-applies the rule; the trigger has to sit immediately after the consonant, and here an e intervenes. Squashing the ending into a glide is the second error. And learners who studied from older textbooks often write "idéia," which the spelling reform abolished.