inútil, useless, unnecessary, in vain.
inutilidad, f., uselessness.
inútilmente, in vain.
invadiente, descending, invading.
invadir, to invade, inundate.
invariablemente, invariably.
inventar, to invent.
inverosímil, improbable, inconceivable.
inveterado, inveterate, deep-rooted.
invierno, winter.