My 2c from personal experience (n=1): 1) Burnout is acute exhaustion caused by successive days of lack of sleep, successive weekends of working late with long

My 2c from personal experience (n=1): 1) Burnout is acute exhaustion caused by successive days of lack of sleep, successive weekends of working late with long delays in launch, feedback or project completion. 2) Depression (not the clinical kind) is chronic exhaustion and chronic depletion of dopamine. No hope. No care for the project, product or for completion because you know it doesn't matter. This is caused by poor feedback, rejections, project failures (product does not work) but mostly because of running out of money. 3) Laziness is when your subconscious is too smart for yourself about the prospects of success resulting in inaction. For example: you may be outwardly excited about a project/product but your internal subconscious mind has already doomed it as a failure therefore you find all sorts of excuses not to start or finish the project. Your subconscious has already done FWIW a cost-benefit and SWOT analysis and judges the project as a no-go or no-continue. 4) Being in the wrong job is the number 1 reason for the causes of all 1), 2) and 3) above.