.  Interference in foreign language acquisition involves unintended transfer of linguistic elements, impacting tone, accentuation, word usage, order, and vocabulary. It challenges bilinguals striving for accuracy, underscoring the complexity of bilingual communication and the need for mitigation strategies. Phonetic and phonological anomalies indicate speech difficulties. Age and phonological interference affect language acquisition, especially post-primary language acquisition. Phonetic interference disrupts auditory-language interaction, impacting speech and perception. Second-language vocabulary acquisition depends on linguistic distance. Intonation, rhythm, and phoneme articulation are also affected. Objective instrumental and auditory examinations are key in studying phonetic interference in bilingual speech.