What musical term indicates playing in a gentle manner, similar to 'dolce'?

The term that signifies playing in a gentle manner, akin to 'dolce,' is 'espressivo.' This term is used in music to indicate that the performer should play expressively, which often involves a softer, more nuanced touch to evoke emotion and convey a tender quality. The connection to 'dolce' lies in the shared emphasis on delicacy and sensitivity in performance.

In contrast, the other options each carry different meanings. 'Legato' refers to the smooth and connected manner of playing notes, ensuring that each note transitions smoothly into the next without perceptible breaks, rather than focusing on gentleness or expressiveness. 'Dolente' translates to playing mournfully or in a sorrowful manner, presenting a distinct emotional quality that diverges from the gentle placidity of 'dolce.' 'Adagio' denotes a slow tempo which can facilitate gentleness but is primarily concerned with the speed of the music rather than the expression or manner of play. Together, these distinctions highlight why 'espressivo' is the most appropriate choice for describing a gentle manner in music performance.