shrewd

"The businesswoman made a shrewd investment by buying the property before anyone else realized its potential. "

"The student's shrewd observation of the teacher's patterns helped her predict the upcoming exam questions. "

"The street vendor was shrewd; he knew exactly how to negotiate with each customer to get the best price. "

"The shrewd businesswoman negotiated a favorable deal for her company. "

"a shrewd guess"

"a shrewd blow, or assault"

"a shrewd wind"

"The dark alley seemed a shrewd place to walk alone at night. "

"The teacher's shrewd look suggested she knew the student's answer was incorrect. "

"The teacher's shrewd remarks about the student's performance were meant to hurt, not help. "

"Her shrewed comments about her coworkers' lunches were hurtful and unnecessary. "

"The customer service representative's shrewd tone quickly silenced the angry customer. "