Grammar stays the same in borrowings. For instance, Italian has greek borrowings for centuries, that disobey the gender endings (-o for masculine and -a for fem

Grammar stays the same in borrowings. For instance, Italian has greek borrowings for centuries, that disobey the gender endings (-o for masculine and -a for feminine, m. fotógrafo -> f. fotógrafa), and the biggest offender is the Greek suffix -ista, which can have both genders (communista, feminista, etc.). Nevertheless Italian grammar didn't get broken. (I'm personally outraged that they say "il mouse" (pronounced il máus), instead of native il topo/la rata as every other Latin language, but Italian grammar still functions fine.).