Underwent is a verb that means to go through an experience or to endure something. Its antonyms are words that depict the opposite of undergoing or experiencing. One of the antonyms for underwent is avoided, which means to stay away or to prevent something undesirable from happening. Another antonym for underwent is bypassed, which means to skip or to find an alternative route. Endured is another antonym of underwent, which means to withstand or to tolerate something difficult. Lastly, another antonym for underwent is evaded, which means to avoid or escape from something. By knowing the antonyms of underwent, one can easily express the opposite meaning in a sentence.