KEY: Infrangible, [See FRANGIBLE].
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KEY: Infrequency.
SYN: Rarity, fewness, paucity, dearth, scantiness.
ANT: Multitude, abundance, frequency, recurrence.
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KEY: Infrigidation, [See INCANDESCENCE].
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KEY: Infringe.
SYN: Break, violate, transgress, contravene.