unfair

"He was drunk and made some very unseemly comments."

"The old, patched-up coat was quite uncomely, but it kept him warm in the winter. "

"His behavior at the school picnic was disgraceful; he threw food and yelled at the other children. "

"It is inappropriate to burp at a formal dinner."

"The cancellation of the school play disappointed the students. "

"Her outburst of anger surprised everyone in the quiet office. "

"The heavy rain was unexpected; we had planned a picnic in the park. "

"The student looked sorrowful after failing the important math test. "

"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 politician received a lot of public criticism for his controversial stance on the issue."

"Hey, beautiful!"

"The carnival games were unfairly difficult, and hardly anybody won a prize."