indudable, certain, doubtless.
indudablemente, doubtless.
indulgencia, indulgence, absolution.
industria, industry.
inefable, unspeakable.
inerte, inert, lifeless.
inescrutable, inscrutable.
inexplicable, incomprehensible.
inextinguible, inextinguishable, perpetual.
infalibilidad, f., infallibility.