The word "jump-start" means to start something quickly or to provide a boost to get it going. The antonyms for this word would include terms like "slow down," "halt," "retard," "impede," "setback," or "inhibit." These words suggest the opposite of jump-start and convey the idea of a decrease in velocity or a lack of progress. While "jump-start" is associated with rapid action and motivation, its antonyms indicate a more sluggish, even stalled, state of affairs. Therefore, to counteract the negative effects of these antonyms, one should maintain a positive outlook and employ strategies that promote productivity and momentum.