Clue: Become pitiless

Answer: HARDEN

Length: 6

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Similar Clues:

• Pitiless (e.g. CRUEL with 5 letters)
• The Sphinx's is "blank and pitiless as the sun," per Yeats (GAZE with 4 letters)
• Pitiless taskmasters (LEGREES with 7 letters)
• More pitiless (e.g. STONIER with 7 letters)
• Pitiless place of song (TOWN with 4 letters)

Nothing more is found...