Spanish · Pronunciation Guide
NOON-kah — the u is "oo", not the flat vowel of English "nun".
Two syllables: NUN-ca, stressed on the first, which is where the default rule puts it for a vowel-final word. It never changes form. What is worth knowing is its behaviour in a sentence: placed before the verb it stands alone, but placed after it requires a "no" in front of the verb, giving the double negative Spanish insists on.
Listen: nunca
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Nunca he estado en Perú.
I've never been to Peru.
Listen: Nunca he estado en Perú.
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"Nunca he estado en Perú" puts the adverb first, so no extra "no" is needed — say "no he estado nunca" and you would need both. "He estado" runs together with a silent h, giving e-es-TA-do, and "Perú" carries an accent to hold the stress on the final ú against its vowel ending.
"NUN-ka", with the flat vowel of English "nun", is the usual reading, when Spanish wants a rounded "oo". The grammar is the sharper trap: learners who put "nunca" after the verb without adding "no" produce sentences that sound broken to a native ear. Either "nunca voy" or "no voy nunca" works; "voy nunca" does not.