There are several synonymous phrases and adjectives that can be used to convey the meaning of "for a short time". One such phrase is "briefly", which implies a quick and temporary occurrence. "Temporarily" is another word that denotes a short span of time, but with the implication of a return to normalcy afterward. "Momentarily" and "fleetingly" are similar in their connotations of brevity and transience. Alternatively, the adjective "fleeting" can describe something that occurs briefly or for a short time. Ultimately, the choice of synonym depends on the context and the nuance that the speaker or writer intends to convey.