untiring

"I just got back from my morning run."

"Despite the long hours and demanding workload, the student remained tireless in their studies. "

"My grandmother seems to have an inexhaustible supply of energy; she's always doing something! "

"After the party, only a few close friends remained to help clean up. "

"My uncle ran in the city marathon last weekend. "

"It took a lot of effort to find a decent-sized, fully-furnished apartment within walking distance of the office.   He made a conscious effort to not appear affected by the stories in the paper."

"He is a student of life."

"From Moscow, the distance is relatively short to Saint Petersburg, relatively long to Novosibirsk, but even greater to Vladivostok."

"He completed the assignment on time."

"The resolute faced every obstacle with unwavering determination, never giving up on their goals. "

"My grandmother's optimism was unfailing; even after a difficult day, she always found something positive to focus on. "

"Despite her parents' disapproval, Sarah pursued her dream of becoming a musician. "