1The telltale signs of wear on the soles of her shoes suggested she had been walking for hours.
2Is the smell of smoke a telltale sign of a fire in the building?
3The telltale look on his face revealed that he was hiding something.
4If you notice any telltale symptoms of illness, consult a doctor immediately.
5The police found a telltale piece of evidence at the crime scene that led them to the suspect.