Toss-up is a common term used to describe a situation where the outcome is uncertain or equally likely. However, there are many synonyms for this word that can be used to convey the same meaning. Some of these alternatives include "50-50 chance," "even odds," "coin flip," "uncertain outcome," "dead heat," and "draw." Other synonyms include "equally balanced," "neck and neck," "balanced contest," "undecided," and "stalemate." Each of these synonyms can help to add variety and nuance to a writer's vocabulary, allowing them to express themselves more effectively and with greater precision.