I will have muttered
-habré murmurado
Future perfect conjugation of mutter. There are other translations for this conjugation.

mutter

TRANSITIVE VERB
(to say in a low voice)-murmurar
Synonyms for mutter
Antonyms for mutter
INTRANSITIVE VERB
(to say in a low voice)-murmurar
Synonyms for mutter
Antonyms for mutter
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