Watching attentively - monitor.
No, the word unobservant is not an adverb.This word is an adjective and a noun.The adverb form of the word "unobservant" is unobservantly.
Obliviousness
Asleep, not paying attention, lazy
The word alert can be an adjective, which describes someone who is aware of his or her surroundings and is paying attention to them. The guard was alert. Alert can also be a verb; if you alert someone to some situation you are directing their attention to it. I alerted the policeman to the robbery in progress.
Beating.
crystalline
Insanity?
Hearkening means paying attention. Hearkening to the warning will save you trouble in the end.
Uncomfortable around others, fidgeting/not paying attention/'non caring' voice.
word count
players that are not paying attention recieve admonishing quetions from their coach
"Wasn't that a boring lesson?" "I don't know - I wasn't paying attention."