According to Osho, there is a clear difference: no-thought is a luminous, alert silence born of total awareness; laziness is a dull, sleepy blankness born of inertia. In no-thought, energy is heightened, presence is sharp, compassion and intelligence flower. In laziness, consciousness sinks, avoidance rules, and growth stalls. Watchfulness distinguishes meditative emptiness from tamasic numbness.
No-thought is being wide awake and quiet inside; laziness is being sleepy and switched off.