impenetrable
/ˌĭ m ˈp ĕ n ə t r ə b ə l/
ĭm-pĕn-e-tra-ble
Rule 1
Vowels usually say their short sound in a closed syllable.
Words ending in -able
Inexplicable Honorable Fashionable Unfashionable Inhospitable Terminable
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