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KEY: Gratitude.
SYN: Thankfulness, gratefulness.
ANT: Unthankfulness, ingratitude, thanklessness, oblivion, resentment, indignation.
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KEY: Gratuitous.
SYN: Free, uncompensated, voluntary, unwarranted, groundless, wanton, unnecessary, unsought.
ANT: Compulsory, involuntary, obligatory, necessitated, warranted, well-founded.
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KEY: Gratuity, [See GRATUITOUS and BONUS].