treacherous

"The used car salesman was deceitful; he lied about the car's history to get a higher price. "

"She secretly hoped he would ask her to the dance. "

"The architect planned the building for the client."

"His treachery was evident when he leaked the team's secret strategy to the opposing team. "

"My old car is unreliable; it often breaks down on the way to work. "

"if I make a promise, I always stick to it;  he broke his promise"

"He had to incline his body against the gusts to avoid being blown down in the storm."

"He wanted to exhibit his baseball cards."

"We spent the weekend hiking in the mountains."

"Railway crossings without gates are highly dangerous."

"The lightning caused thunder."

"The politician spoke at the school assembly about the importance of community involvement. "