verbessert
improved
Describes a state that is better or of higher quality than before.
Die neue Software-Version hat eine deutlich verbesserte Benutzeroberfläche.
The new software version has a significantly improved user interface.

improved
Loading your saved state.
improved
Describes a state that is better or of higher quality than before.
Die neue Software-Version hat eine deutlich verbesserte Benutzeroberfläche.
The new software version has a significantly improved user interface.

'Verbessert' (improved) is the past participle of the verb 'verbessern' (to improve). The verb is made up of the prefix 'ver-' (which here indicates a change) and 'besser' (better). So 'verbessert' describes something that has been 'made better'.
Dank der Reparatur ist die Funktion des Geräts nun verbessert.
Thanks to the repair, the device's function is now improved.
As an adjective, 'verbessert' (improved) usually stands directly before a noun. It describes that this noun has undergone a positive change and is now of higher quality.
Wir bieten eine verbesserte Version unserer App zum Download an.
We offer an improved version of our app for download.
Common nouns combined with 'verbessert' (improved) are 'Version' (version), 'Qualität' (quality), 'Leistung' (performance), 'Situation' (situation), or 'Rezeptur' (formula/recipe).
Die Sportlerin zeigte eine deutlich verbesserte Leistung im Wettkampf.
The athlete showed significantly improved performance in the competition.
unchanged
'unverändert' and 'verbessert' are opposites here. 'unverändert' says that something has remained the same. So it did not become different. 'verbessert' says that something has become different and is now better than before. If you only want to say that there was no change, use 'unverändert'. If the quality or situation has become better, 'verbessert' fits.

Für den nächsten Termin hat sie die Präsentation noch einmal verbessert.
For the next appointment, she improved the presentation once again.
Beim Termin bleibt der Plan für morgen unverändert.
At the appointment, the plan for tomorrow remains unchanged.