The phrase "merciful toward" is correct and usable in written English.
You can use it to describe someone who shows mercy or compassion toward another person or situation. For example, you can say "She was merciful toward him, even though he had treated her badly."
And may God have mercy on them, because I'm not feeling particularly merciful toward anybody who can deliberately do something so cruel.
It was Churchill being merciful toward Halifax and the memory of Britain's transcendent determination.
We are apparently more merciful toward older actors relying on technology to cover memory lapses.
When, for example, an offender demonstrates repentance for her offence prior to punishment, the law has reason to be merciful toward her and to impose a less severe punishment than that which she deserves (Tasioulas, 2006).
The language and tone of Monday's document, read to the assembly in the presence of Pope Francis, appeared to show that the advocates of a more merciful tone toward homosexuals and Catholics in so-called "irregular situations" had prevailed.
"Merciful Lord, turn toward us and listen to our prayers," he said.
He loved the way his boat's wake spread, how the water gathered itself before being released into the relative calm of the river as it headed toward the merciful breadth of Lake Ontario.
Synchronized and smiling, the Liberty has the rhythm these days, rolling toward the Women's National Basketball Association playoffs as surely as Charlotte is trudging toward a merciful end of the season.
He encouraged Reince Priebus, the increasingly mortified chairman of the Republican National Committee the upcoming results in Indiana just might be the poor man's merciful undoing to keep driving toward the cliff's edge, cracking that "the Republican Party, the nomination process, it's all going great! Keep it up".
I also pray for the immediate and safe release of hostages and ask God, the Merciful, to lead us all toward mutual respect and peace.
Blessed are the merciful, for they shall obtain mercy.
