kurzzeitig
brief / temporary
Lasting only for a short time; of short duration.
Nach dem Stromausfall war das Internet nur kurzzeitig unterbrochen.
After the power outage, the internet was interrupted only briefly.

brief / temporary
Loading your saved state.
brief / temporary
Lasting only for a short time; of short duration.
Nach dem Stromausfall war das Internet nur kurzzeitig unterbrochen.
After the power outage, the internet was interrupted only briefly.

The word is a compound of 'kurz' (short) and 'Zeit' (time) with the adjective ending '-ig'. So it literally means 'of short time'.
Es gab eine kurzzeitige Störung im System.
There was a brief disruption in the system.
'Kurzzeitig' (brief/temporary) can stand as an adjective before a noun or as an adverb describing a verb. As an adverb, the form remains unchanged.
Der Laden war wegen einer kurzzeitigen Renovierung geschlossen.
The shop was closed because of a brief renovation.
'Kurzzeitig' (brief/temporary) is often used to describe unexpected or temporary events. Typical nouns are 'Unterbrechung' (interruption), 'Störung' (disruption), 'Ausfall' (outage/failure), or 'Besserung' (improvement).
Nach dem kurzzeitigen Stromausfall funktionierten alle Geräte wieder.
After the brief power outage, all devices worked again.
short / brief
'kurz' and 'kurzzeitig' both describe a short duration. 'kurz' is very general and common in everyday language: 'ein kurzer Anruf' (a short phone call), 'eine kurze Pause' (a brief break), 'ein kurzer Besuch' (a short visit). 'kurzzeitig' sounds a bit more precise and often more factual. It describes that something happens or applies only for a short period of time, for example a disruption, a closure, or an improvement. Learners may confuse the words because they are similar in time-related meaning. A simple guide is: for normal everyday situations, 'kurz' is often more natural; for temporary states, 'kurzzeitig' works well.

Am Wochenende war die Internetverbindung kurzzeitig unterbrochen.
Over the weekend, the internet connection was briefly interrupted.
Das Meeting war kurz, weil alle gut vorbereitet waren.
The meeting was brief because everyone was well prepared.