When we want to convey the opposite of "gave a boost," we must look at words that signify a decrease in energy, enthusiasm or progress. Words like hindered, obstructed, slowed down or impeded are antonyms of "gave a boost." These words suggest obstacles, challenges and challenges that create difficulties for progress. When we say someone or something gave a boost, we mean a positive force propelled an individual or situation forward. So, the opposite or antonym would convey a negative force that creates resistance, reluctance or limited success. It's important to choose the right antonym to ensure clear communication and understanding of the intended message.