taciturno

adj. taciturn, saturnine, glum, quiet, dumb, uncommunicative

adj. taciturn, reticent; glum, morose, sullen

adj. moody; morose, sullen; reticent, silent; taciturn, uncommunicative

= morose, moody [moodier -comp., moodiest -sup.], hipped.
Ex: His limber writing consequentializes the inconsequential, and there is not one morose moment in his work, no hint of sourness.
Ex: Moody explorations of unexplained phenomenon can also be found = También se pueden encontrar exploraciones taciturnas de fenómenos inexplicables.
Ex: His in danger of becoming hipped, a prey to his own doubts and fears, and unable to accomplish anything in life beyond catering to his own
morbid fancies.