inocentísim-o, -a, most innocent.
inofensiv-o, -a, harmless.
inopinadamente, unexpectedly.
inoportunamente, untimely, inopportune.
inquiet-o, -a, restless, anxious.
inquietud, f., anxiety, restlessness.
insan-o, -a, insane, crazy.
insensible, insensible.
insidios-o, -a, crafty, wily.
insistir, to insist, persist.