The phrase "without hitch" means something happened without any problems or difficulties. The antonyms for this phrase include "with difficulty," "with trouble," "with hiccups," "with obstacles," "with setbacks," "with complications," and "with glitches." These words describe situations where there were difficulties encountered while doing something. When things don't go smoothly and there are obstacles that crop up, it can cause delays or even cause the project to fail. Therefore, it is important to identify these words in order to use them to describe situations where things did not go smoothly.