The phrase "nothing loth" is used to describe someone who is willing or eager to do something without hesitation. There are several synonyms that can be used in place of this phrase, such as "game," "ready," "willing," "enthusiastic," "keen," and "excited." These words convey a sense of willingness and eagerness to act or participate in an activity. Additionally, the phrase "nothing loth" can be replaced with several idioms such as "chomping at the bit," "eager as a beaver," "itching to go," or "fired up." These phrases add color to the language and paint a vivid picture of someone who is excited and ready to take on a challenge.