The term 'completely out of it' can be described by two crossword solutions: catatonic (9 letters) and LOST (4 letters). Catatonic is a state of extreme mental and physical unresponsiveness, usually caused by a severe psychiatric disorder. It is characterized by a lack of movement and speech, and an inability to react to external stimuli. LOST is a state of being unable to find one's way or direction, often due to confusion or disorientation. Both terms describe a person who is not in control of their mental faculties and is unable to interact with the world around them.