When it comes to expressing uncertainty or an inability to predict an outcome, the phrase "no telling" works effectively. However, if you find yourself seeking alternatives, a few synonyms can surely enhance your vocabulary. "Unclear" portrays the sense of ambiguity, leaving the situation or outcome without obvious clarity. "Unsure" denotes a lack of confidence in predicting or determining what may occur. Another option, "indeterminate", implies that the outcome is not yet established or definable. Additionally, "unknowable" suggests that the result or answer is beyond comprehension or impossible to know in advance. These synonyms serve as great substitutes for "no telling" while articulating a similar concept of unpredictability or uncertainty.