"Hardly ever" is a common phrase used to indicate something that rarely occurs or almost never happens. However, there are several synonyms that convey the same meaning and can be used interchangeably. Some of these are "rarely," "seldom," "scarcely ever," "infrequently," and "almost never." These synonyms can be used when describing events, occurrences, or situations that happen very rarely, such as natural phenomena, weather changes, or unique opportunities. They add a certain level of emphasis to the fact that something is unusual or uncommon, and can be used to make a point or provide context to a situation.