Translation of "taciturna" into English

Quando entrò Susie, però, sembrava taciturna e un po’ restia a parlarmi.

But when Susie walked in, she seemed quiet and somewhat hesitant to meet with me.

Jason era un individuo taciturno, per cui era sempre una vera sorpresa quando diceva qualcosa.

Jason was a taciturn individual, so it was always a real surprise when he said anything.