stony-heartedly

comparative more stony-heartedly · superlative most stony-heartedly

1. In a stonyhearted manner; pitilessly.

   ...their women refused to let their newly-born daughters have access to their milk, and do put them in any way to death: but this practice is not general through all the subdivisions of their tribe, though in several places they do thus stony-heartedly kill them.

   1811, Edward Moor, Hindu infanticide: An account of the measures adopted for suppressing the practice of the systematic murder by their parents of female infants, page 17