Definition: (verb) Corrupt, debase, or make impure by adding a foreign or inferior substance; often by replacing valuable ingredients with inferior ones.
Synonyms: dilute, debase, load, stretch.
Usage: Our supply of coffee was running out, so I suggested we adulterate it with ground acorns to make it last longer.
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Definition: (adjective) Showing unfeeling resistance to tender feelings.
Synonyms: granitic, obdurate, stony.
Usage: He maintained a hard, careless deportment, indicative of neither joy nor sorrow: if anything, it expressed a flinty gratification at a piece of difficult work successfully executed.
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Definition: (adjective) Existing as an essential constituent or characteristic.
Synonyms: inherent, integral, constitutional.
Usage: I have learned to tame it, but competitiveness is a built-in part of my personality, and I cannot discard it completely.
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