immovable

"My friend told me there was something in the box, but I didn't know what it was yet. "

"My grandmother taught me how to bake cookies when I was a child. "

"The children physically exhausted themselves playing tag in the park. "

"The teacher remained impassive despite the student's disruptive behavior. "

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

"The child was unyielding in his desire for a cookie before dinner, no matter how much his mother tried to reason with him. "

"Even when things got difficult, her steadfast dedication to her studies helped her graduate with honors. "

"My sister got a permanent for her wedding, which was supposed to last for several months. "

"The rules of the game are unalterable; we must follow them exactly as they are written. "

"It’s easy to promise anything when you have no intention of fulfilling any of it."

"After careful consideration, the student made a decision about which college to attend. "

"The cook attending the bonfire with kindling quickly warmed the chilly evening air. "