infortune, n.f., misfortune, adversity.
infortuné, -e, n. and adj., unfortunate, unhappy, ill-fated, wretched person; unfortunate, unhappy, ill-fated, wretched.
infracteur, n.m., infractor, infringer, breaker, violator.
infraction, n.f., infraction, infringement, breach, violation. Une — à la loi; a breach of the law.
infranchissable, adj., insurmountable, insuperable, impassable.
infrangibilité, n.f., infrangibility.
infrangible, adj., infrangible.
infréquenté, -e, adj., unfrequented.
infructueusement, adv., fruitlessly, to no purpose, in vain.
infructueu-x, -se, adj., unfruitful, fruitless, unavailing.