at worst, at the worstadvadverb: Describes a verb, adjective, adverb, or clause--for example, "come quickly," "very rare," "happening now," "fall down."
(imagining worst scenario)
在最坏的情况下 zài zuì huài de qíng kuàng xià
最坏 zuì huài
At worst, we'll have learnt something from the experience.