impuro, -a impure, foul.
inagotable adj. never-failing, inexhaustible.
incentivo m. incentive.
incierto, -a uncertain, unknown, doubtful, unsteady, wandering, restless.
inclinar incline, bend, bow, droop, nod.
indiferencia f. indifference.
indiferente adj. indifferent.
indomable adj. indomitable.
inefable adj. ineffable, unutterable.
infalible adj. infallible.