"Not at any time" can be replaced with several synonyms, including "never", "at no point", "not ever", "not once", "not evermore", "not in any case", "at no time", "not under any circumstances", "not ever again", "not for a single moment", and "not in any way, shape, or form". Using synonyms can add variety to your writing and help convey your message more effectively. Depending on the context, certain synonyms may be more appropriate than others. However, all of these options can be used interchangeably to express the same idea.