She gave an involuntary laugh when the cat jumped onto her lap.

The involuntariness of her reaction revealed how deep the shock had been.

The doctor explained that the heart is essentially an involuntary muscle that continues to beat without conscious thought.

The jury convicted him of involuntary manslaughter after finding that his negligent driving had caused the fatal accident.

The doctor explained that involuntary muscles control digestion and heartbeat without conscious effort.

New evidence has reopened several cold cases classified as involuntary manslaughters.

After the factory closed, the neighborhood gradually became an involuntary park where maples and ferns crept over crumbling brick.

Many urban planners were surprised when involuntary parks emerged on vacant lots during the recession.