transitory, ephemeral, temporary, impermanent, short-lived, fugacious, transeunt, passing, nontransient, transiency, more...

permanent, enduring, lasting, stable, perpetual

more, only, initial, current, common, less, uncommon, rare, off, short, very

comes and goes,   easy to forget,   not staying long,   boomtown inevitably,   housed temporarily,   temporary in nature,   something temporary,   not for a long time,   a transitory place,   short-term matters