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Related Clues:
- Inexorable
- Enduring — constant
- With a lasting quality
- Resistant to pressure
- "Goody Two Shoes" singer
- Impervious to appeals
- British New Wave singer
- Implacable
- Unalterable
- Like some parental tones
- Hard, as a mattress
- Business compact
- Impervious to pleas or persuasion
- Insistent he was a new romantic in the 1980s
- Like some tofu