the earliest day
adv. adj.
el primer día
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First match in Español-Inglés / English-Spanish dictionary:
earnest [1]
a adj
(=serious)
[person, character etc] serio, formal
(=sincere) sincero
(=eager)
[wish, request] vivo, ferviente
it is my earnest wish that deseo fervientemente que + subjun
b n
in earnest en serio
are you in earnest? ¿lo dices en serio?
Translation English - Spanish Collins Dictionary  

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"Collins Spanish Dictionary 8th edition published in 2005 © William Collins Sons & Co Ltd 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005"