The phrase "Columbian spirit" refers to the spirit of exploration, discovery, and adventure associated with Christopher Columbus and his voyage to the Americas. Antonyms for this phrase would include terms that convey the opposite of these qualities, such as lethargy, apathy, and complacency. Other antonyms could include words associated with fear, trepidation, and avoidance, such as timidity, cowardice, and reticence. Overall, the antonyms for "Columbian spirit" suggest a lack of excitement and willingness to venture into the unknown, instead favoring safety and familiarity.