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When adapting loans into Swahili, a series of vowels are inserted, resulting in forms that differ from those in the source languages (etymons). This work 1) identifies the nature of these inserted vowels, and 2) develops an explanation of the system behind the various phonetic realizations of these vowels. Vowels examined are (as the title suggests) epenthetic rather than excrescent. Typically, when Swahili loanwords are adapted via epenthesis, features cannot cross from one side of the stressed syllable (which in Swahili is the penult). Therefore, word-final epenthetic vowels must appropriate features from adjacent consonants. Consonants spreading coronal features will result in a coronal epenthetic vowel [i], consonants spreading labial features will result in a labial epenthetic vowel [u], and consonants spreading pharyngeal features will result in a pharyngeal vowel [a]. Dorsal consonants do not contribute a feature, and the feature [coronal] is inserted by default. In pre-stress environments, both vocalic and consonantal material is available for Feature-Spreading. Features of vowels spread more freely than features of consonants, so vowel-vowel feature spreading is more prevalent. Several idiosyncratic forms exist in which vocalic material that existed in the etymon seems to have survived in the realization of epenthetic vowels. A handful of suppletive forms exist which seem to break the constraint on crossing from one side of the stressed vowel to the other.
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