According to Osho, tamas is lethargy—utter heedlessness. It is the dull, inert, sleep-like quality that makes one careless, unalert, and driven by habit rather than awareness. When tamas dominates, energy sinks, motivation fades, and consciousness is clouded. Recognizing tamas is the first step to bringing in awareness and vitality, transforming heaviness into wakefulness.
It’s the lazy, sleepy state where you don’t pay attention or care.