Just like some humans I know,' Leon said in a caustic tone.

"I, too, am aware of that," replied the general in faintly caustic tones.

Walker's brows lifted a fraction at her dry, caustic tone.

His caustic tone and angry eyes made her cringe as he reached for her.

Todd said in a soft but caustic tone.

His caustic tone widened her eyes, and he gave her a thin smile.

"Then they were very human," Bren said in a caustic tone.

Leri asked in a caustic tone, her voice breaking effectively.

He noted the caustic tone in her voice when she mentioned Andrews's name.

"Made by Aivas, of course," she said in a caustic tone.