The word "ambs-ace" is an obscure term that refers to a state of extreme uncertainty or doubt. While this word may not be widely recognized, there are several synonyms that can be used to convey a similar meaning. For example, the word "limbo" refers to a state of uncertainty or indecision, while "quandary" and "dilemma" both suggest a state of confusion or perplexity. Other related terms include "uncertainty," "indecision," "confusion," and "hesitation." By using these synonyms, writers and speakers can help to convey a sense of uncertainty or doubt in a more relatable way.