Neither temporary nor entirely permanent; of indefinite duration(adjective)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "semipermanent" in a sentence
"The museum could define itself as a performance venue and build an audience for a kind of semipermanent Folklife Festival under its roof."
"B" that proposed adding "semipermanent" members that would face reelection."
"In short, with the filibuster — a dubious tradition that encourages senators to act as spoilers rather than legislators, and that has locked the political system into semipermanent paralysis by ensuring that important decisions are endlessly deferred."