Headlong and Like mad

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

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

Like mad adverb - With great speed or effort or intensity.

Headlong and like mad are semantically related in very fast topic. Sometimes you can use "Headlong" instead an adjective phrase "Like mad".