admonish: [14] In Middle English times this verb was amoneste. It came, via Old French amonester, from an assumed Vulgar Latin verb *admonestāre, an alteration of Latin admonēre (monēre meant ‘warn’, and came from the same source as English mind). The prefix ad- was reintroduced from Latin in the 15th century, while the -ish ending arose from a mistaken analysis of -este as some sort of past tense inflection; the t was removed when producing infinitive or present tense forms, giving spellings such as amonace and admonyss, and by the 16th century this final -is had become identified with and transformed into the more common -ish ending. => mind[admonish etymology, admonish origin, 英语词源]