Her dying exhumed grief I hadn't known I had--it has been merciless in its ability to dredge long buried emotion to the surface.
ALS, or Lou Gehrig's disease, is merciless: it shuts down your ability to move, one limb at a time, but allows your brain to remain intact.
But there is also Yael, a Jewish girl whom merciless camp experimentation has left with the ability to change her appearance at will.
His greatest strength lies in his ability to strain his story through a merciless interior monologue that springs from something deeper and more incriminating than sympathy, and bares every turn of his characters' thoughts and feelings.
His curiosity and his ability to influence others combine to make him a cold, merciless observer of his manipulations and their results.
The latter case covers subjects who, due to their most objectionable nature, their dangerousness, or their ability to serve as tools of propaganda for the enemy, are suitable for elimination, without respect for persons, by merciless treatment (namely, by execution).
At the cook-off, Homer demonstrates an extraordinary ability to withstand hot foods, until he falls victim to Chief Wiggum's chili which is spiked with "The Merciless Peppers of Quetzlzacatenango! Grown deep in the jungle primeval by the inmates of a Guatemalan insane asylum".
The arithmetic is merciless.
"These are merciless fighters.
The retaliation was merciless.
Sundown brought merciless cold.
