wholeheartedly; single-mindedly; fervently; intently
Describes doing something with complete focus and dedication, putting one's whole heart into it.
See also: 一心
彼は一心に勉強した。
He studied single-mindedly.
彼女は一心に祈った。
She prayed fervently.
She was praying with all her heart.
My father worked tirelessly and single-mindedly for the family.
The child gazed intently at his mother's face.