The antonyms for the word "more onrushing" are slow, unhurried, delayed, and sluggish. While the word onrushing implies a sense of urgency and speed, its antonyms describe a state of being slow, lazy, or even stagnant. These antonyms are commonly used to describe a person, an event, or a process that lacks vigor or urgency. For instance, a slow-moving car, a delayed project, or an unhurried person. In contrast, the word "more onrushing" would be used to describe a situation or an event that is happening quickly and with great force. Antonyms are essential for effective communication, as they allow individuals to convey their thoughts and ideas more precisely.