Headlong and Imperceptive

Headlong adjective - Acting or done with excessive or careless speed.

Imperceptive and headlong are semantically related In some cases you can use "Imperceptive" instead an adjective "Headlong".

Imperceptive adjective - Not having or showing a deep understanding of something.

Headlong and imperceptive are semantically related in unthinking topic. Sometimes you can use "Headlong" instead an adjective "Imperceptive", if it concerns topics such as unmindful of future consequences.