8. Shock, startle, paralyze, stun suggest a sudden, sharp surprise that affects one somewhat like a blow. Shock suggests a strong blow, as it were, to one's nerves, sentiments, sense of decency, etc.: The onlookers were shocked by the accident. Startle implies the sharp surprise of sudden fright: to be startled by a loud noise. Paralyze implies such a complete shock as to render one temporarily helpless: paralyzed with fear. Stun implies such a shock as bewilders or stupefies: stunned by the realization of an unpleasant truth.

Did you mean checkable?