Antonyms of adj coolheaded

1 sense of coolheaded

Sense 1
cool, coolheaded, nerveless -- (marked by calm self-control (especially in trying circumstances); unemotional; "play it cool"; "keep cool"; "stayed coolheaded in the crisis"; "the most nerveless winner in the history of the tournament")

INDIRECT (VIA composed) -> discomposed -- (having your composure disturbed; "looked about with a wandering and discomposed air")

Similarity of adj coolheaded

1 sense of coolheaded

Sense 1
cool, coolheaded, nerveless -- (marked by calm self-control (especially in trying circumstances); unemotional; "play it cool"; "keep cool"; "stayed coolheaded in the crisis"; "the most nerveless winner in the history of the tournament")
       => composed (vs. discomposed) -- (serenely self-possessed and free from agitation especially in times of stress; "the performer seemed completely composed as she stepped onto the stage"; "I felt calm and more composed than I had in a long time")