Fatal (4): Electrocuted, Drowned, Stabbed in the Heart.

Severe (3): Impaled, Broken Leg, Shot in Chest, Badly Burned, Terrified.

Moderate (2): Exhausted, Deep Cut to Arm, Concussion, Panicked, Seduced.

Lesser (1): Battered, Drained, Distracted, Scared, Confused.

Harm like "Drained" or "Exhausted" can be a good fallback consequence if there's nothing else threatening a PC (like when they spend all night Studying those old books, looking for any clues to their enemy's weaknesses before he strikes).