intonation, n.f., intonation.
intorsion, n.f., intorsion.
intoxicant, -e, adj., poisonous.
intoxication, n.f., (med.) poisoning.
intrados, n.m., n.f., (arch.) intrados (interior part of a vault).
intraduisible, adj., untranslatable.
intraitable, adj., untractable, ungovernable, unmanageable, unruly, difficult; refractory.
intra-muros, adv., inside a town.
intransigeant, n.m., ultra-republican.
intransiti-f, -ve (-zi-), adj., (gram.) intransitive.