English (New Zealand) vs Sundanese

English (New Zealand) and Sundanese share 15 sounds — roughly 33% of Sundanese's inventory overlaps with English (New Zealand). Shared sounds are ones a speaker already knows from their native language and will generally produce and perceive accurately without explicit training.

The 11 sounds found only in Sundanese represent the greatest pronunciation challenge for English (New Zealand) speakers. The adult brain tends to map unfamiliar sounds onto the closest native equivalent — a process that produces the characteristic "accent" of a second-language speaker. Learning to hear and produce these sounds as distinct requires focused ear training, not just repetition.

Conversely, English (New Zealand) has 30 sounds not used in Sundanese. Native Sundanese speakers learning English (New Zealand) will face the mirror-image challenge with these sounds.

Phoneme inventories from PHOIBLE. Data reflects one documented inventory per language; some variation exists across dialects and sources.