I just can't seem to remember this word. Please help me, thank you so much
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Another word for a temporary solution is stopgap. Cambridge:
(n) something intended for temporary use until something better or more suitable can be found.
It's given as a noun, but is very commonly used as a noun adjunct, in phrases like "stopgap solution", as can be seen fronm the examples in the dictionary I linked.
How about obsolete:
no longer used because something new has been invented
Another word with pretty similar meanings in IT only is deprecated:
be deprecated (computing) (of a software feature) to be considered outdated and best avoided, even though you can still use it, usually because it has been replaced with a newer feature
- A number of features have been deprecated in the latest version of the software.
Here you can see a real life example where both words are used together:
computes variance-covariance matrix This function is obsolete.