infeliz, unhappy, unfortunate, wretched; weak-minded; subst., poor wretch, poor fellow.
infernal, infernal.
infiel, infidel; subst. m. pl., infidels, Moors, Saracens.
infiernos, m. pl., infernal regions; hell.
infinito, -a, infinite.
inflamarse, to catch fire, become inflamed.
influencia, f., influence.
influjo, m., influence.
informe, shapeless, formless.
infundir, to infuse, inspire, instill.