brainish

Definitions of brainish
1

adj characterized by undue haste and lack of thought or deliberation

“(` brainish' is archaic)”
Synonyms:
hotheaded, impetuous, impulsive, madcap, tearaway
incautious
lacking in caution

Sign up, it's free!

Whether you're a student, an educator, or a lifelong learner, Vocabulary.com can put you on the path to systematic vocabulary improvement.