This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Having no pity; merciless.

adj. having, or showing, no pity; merciless

adj. having no kindly feelings; unkind

adj. Destitute of pity; hard-hearted; merciless

adj. Exciting no pity.

Without pity; hard-hearted.

Exciting no pity; unpitied.

Synonyms Merciless, cruel, ruthless, inexorable, unmerciful, unpitying.

adj. without mercy or pity

adj. deficient in humane and kindly feelings

"Zoology, he said, and those sciences which deal with man, continually insist upon what they call the pitiless law of struggle for existence."

merciless    unmerciful    inhumane   

pitilessly   

hard-hearted    merciless   

merciless    ruthless    unforgiving    inexorable    cruel    murderous    vindictive    inhuman    icy    uncompromising