What this means for learners
Polish and Shona share 23 sounds — roughly 55% of Shona's inventory overlaps with Polish. Shared sounds are ones a speaker already knows from their native language and will generally produce and perceive accurately without explicit training.
The 19 sounds found only in Shona represent the greatest pronunciation challenge for Polish 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, Polish has 14 sounds not used in Shona. Native Shona speakers learning Polish 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.