1 The word gun is a noun, but can be used as a verb when you âgun someone down.â Verbing a noun can add spice and drama to an otherwise bland sentence. 2  Experiment with nouns to find one that works well with the verbing process.
As another poster mentioned, depression is a cause of laziness. But let's not forget procrastination. While not officially recognized as a mental disorder, in some people procrastination is both a cause and effect of laziness. Certian people cannot prioritize correctly, to the point I've read many cases where a person will simply always make their priorities come second, mentally speaking.
Substance-induced mood disorder can cause depressed mood, lack of interest in activities, fatigue, and more. Myasthenia gravis is caused by abnormal immune responses that weaken muscles, particularly of the face. Small cell lung cancer is the least common type of lung cancer and can cause a cough, chest pain, and more.