KEY: Duration.
SYN: Period, continuance, term, space, protraction, prolongation.
ANT: Momentariness, instantaneousness, infinity, eternity.
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KEY: Dutiful.
SYN: Obedient, submissive, respectful, docile, deferential, duteous.
ANT: Disobedient, intractable, rebellious, undutiful.
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KEY: Duty.
SYN: Obligation, part, business, responsibility, allegiance, function, once, province, calling, trust, commission, service.