Which word denotes playing 'with energy'?

The term that denotes playing 'with energy' is "Schwungvoll." This German word translates to "with spirit" or "with drive," reflecting a lively and vigorous style of performance. It suggests that the music should be played with enthusiasm and a certain zest, capturing the essence of energetic expression.

In contrast, the other terms carry different meanings. "Stretto," for example, refers to a musical technique often associated with a speeding up of tempo or a tighter harmonic structure, rather than a specific indication of energy in a performance context. "Tristemente" means 'sadly,' which conveys a somber or melancholic character, and "Piangevole" translates to 'plaintively' or 'weeping,' indicating a style filled with sorrow or lamentation. These terms direct the musician to evoke emotions that are the opposite of energy and liveliness.