The word "braintruster" is a colloquial term used to describe someone who is perceived to be an intelligent, resourceful individual capable of solving complex problems. Antonyms, on the other hand, are words that have opposite meanings. Therefore, antonyms for "braintruster" would be words that describe individuals who are not intelligent, resourceful nor capable of solving complex problems. Such antonyms may include words like ignorant, foolish, simple-minded, unintelligent, dense, or dim-witted. These words depict individuals who may lack creativity, are not quick-witted, or are unable to grasp new concepts easily, unlike the typical characteristics associated with braintrusters.