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Apparently the groom was very nervous: one moment he would be ——-, rambling on to his best man about silly, meaningless things, and then abruptly he would turn ——- and could not be prompted to say anything
garrulous . . reticent
grandiose . . taciturn
vociferous . . effusive
melodious . . timorous
munificent . . utilitarian
What is garrulous . . reticent?