Although everyone else cheered, Marcus remained undemonstrative, nodding calmly but offering no outward enthusiasm.

She undemonstratively accepted the award, nodding briefly before returning to her seat.

Her undemonstrativeness often made colleagues mistake her calm for indifference, but she cared deeply.

The theory remained undemonstrated despite years of research.

Her claim that the phenomenon was undemonstrable frustrated the entire research team.

When pressed for evidence, she defended her position undemonstrably, offering only personal anecdotes instead of verifiable proof.