All 7 Uses

invulnerable
in
The Last Olympian
(Auto-generated)

No man may be completely invulnerable.†
Chpt 8
If this didn't work, being invulnerable wasn't going to save me from getting blasted to bits.†
Chpt 9
"But he is invulnerable," Kronos said quietly.†
Chpt 14
Oh dear, I forgot my friend is invulnerable and took a knife for him.†
Chpt 14
If it hadn't been for my new invulnerability, I would've broken every bone in my body.†
Chpt 14 *
"You may be invulnerable in combat," Chiron chided, "but that only makes your body tire faster.†
Chpt 16
When I was at the River Styx, turning invulnerable ...Nico said I had to concentrate on one thing that kept me anchored to the world, that made me want to stay mortal.†
Chpt 22

Definitions:

(1) (invulnerable)
impossible to harm

Standard prefix: "-in" at the beginning of a word often means "not" as in "insufficient" or "impossible" or "incapable".
(2) (meaning too rare to warrant focus)