conspicuous

"A magnet attracts iron filings."

"He took no notice of the changes, and went on as though nothing had happened."

"The answer to the math problem was obvious; everyone in the class knew it immediately. "

"The school principal, a respected figure, announced that his decision was final. "

"Stir the gravy until there are no more lumps."

"My sister is very helpful, especially when it comes to organizing things. "

"Absence makes the heart grow fonder."

"Please direct your attention to the following words."

"I apologize, but "unattractive" is an adjective, not a noun. Here's a sentence using it correctly as an adjective, keeping your other guidelines in mind: "He felt unattractive after getting a bad haircut." "

"The easy was a relief after a difficult week of work. "

"The difference in her haircut was noticeable immediately. "

"The teacher pointed to the student's forehead and said, "Concentrate!" "