Leasy is a term used to describe something that is lazy or lacking in energy. However, there are several other synonyms which can be used to express the same idea. Words like indolent, idle, sluggish, slothful, torpid, and lethargic can all be used to indicate a lack of energy or motivation. Additionally, terms like inactive, inert, and dormant can also convey the same sense of inactivity or laziness. Depending on the context, other words like apathetic or listless may also be appropriate to use. Ultimately, the choice of which synonym to use will depend on the tone and context of the sentence in question.