Outspoken

wiktionary

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From outspeak, equivalent to out- +‎ spoken.

etymonline

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outspoken (adj.)

"given to speaking freely, candid, free or bold of speech," 1808, originally Scottish, from out- + -spoken. According to OED, the past participle "has here a resultant force, as in 'well spoken', 'well read'." Related: Outspokenly; outspokenness. Earlier was outspeaking, in reference to the voice, "loud, resonant" (mid-15c.).