One of the mysteries of the English language finally explained.
From the inconvenience or difficulty involved (used with reference to an argument opposing a proposition on the grounds that it would cause hardship, inconvenience, or some other negative consequence).
Early 17th century. From post-classical Latin ab inconvenienti from the inconvenience or difficulty from classical Latin ab from + inconvenienti, ablative of inconveniēns something discordant, use as noun of inconveniēns, adjective.
ab inconvenienti/ab ɪnkɒnviːnɪːˈɛntʌɪ//ab ɪnkɒnvɛnɪˈɛnti/
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