impassable

"Wampum was used as a currency by Amerindians."

"There has been snowfall every day this week."

"The train passed through the tunnel. "

"The incapable student struggled to complete even the simplest assignments. "

"She surmounted her fear of public speaking and delivered a fantastic presentation. "

"The students negotiated with the teacher for a later deadline on the assignment. "

"The song's constant worry about failing the exam was its main overcome. "

"She carried a sack of groceries in from her car and placed it on the kitchen table."

"A big obstacle to understanding the manual was that it had been poorly translated from the Japanese."

"We spent the weekend hiking in the mountains."

"The hiking trail followed a distinctive terrain of granite, making it a popular spot for rock climbers. "

"The artist crossed two lines to create an X on the paper. "