¿Qué significa "mustio" en español?
Is there an idiomatic meaning behind this word?

Question

Answer

Hipócrita, mentiroso, falso.

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If you are talking about people, it means sad and if you are talking about plants it means  dry, without their natural colours.

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Hi Gregory,

In Mexico, it means something different,  it is someone who hides his true self and pretend to be humble and kind, when in fact its a mean/harsh person (always misbehaving at your back, like spreading bad rumors about you, etc)   . It is more commonly applied to women (mustia)

Hope it helps!!
Saludos

Answer

MUSTIO: Es un adjetivo que se puede usar tanto en personas como en plantas. 
Significa: Desanimado, melancólico (en personas)
Significa: Marchita (en plantas)

Por ejemplo:
María lleva todo la semana mustia, creo que ha roto con su novio.
Desde que empezó a hacer frío las margaritas están mustias.

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