Solo jazz piano

未練 translates to “lingering affection” or “attachment”

未 (mi) “not yet”
 練 (ren) “practice” or “train”.

So together, they metaphorically represent the concept of something (often a feeling or desire) that has not yet been completely worked out or resolved. It’s used to express sentiments of regret, lingering affection, or attachment, typically towards a person or a past event.