lethargic

This term describes a state of profound sluggishness that transcends simple tiredness. It suggests a heavy, oppressive lack of energy that affects both the physical body and the mental state, often manifesting as a slow response to stimuli or a general indifference to surroundings. When applied to systems or economies, it denotes a stagnant condition where growth is stalled and there is a noticeable absence of vitality or momentum. It carries a more clinical or systemic connotation than words like lazy, implying a condition rather than a character flaw.