*inonder*, to overrun,
*inouï*, unheard of.
*inqui-et, -éte*, anxious.
*inquiétude*, f., anxiety.
*insensé*, adj., insane; n. m., fool.
*insensible*, indifferent.
*insensiblement*, by degrees.
*insolent*, impudent.
*insouciance*, f., carelessness, thoughtlessness.
*insouciant*, heedless.