unverändert
unchanged
Not changed in its condition, form, or value; having remained the same.
Trotz der Renovierung ist der Charakter des Hauses unverändert geblieben.
Despite the renovation, the character of the house has remained unchanged.

unchanged
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unchanged
Not changed in its condition, form, or value; having remained the same.
Trotz der Renovierung ist der Charakter des Hauses unverändert geblieben.
Despite the renovation, the character of the house has remained unchanged.

The word is logically structured: the prefix 'un-' means 'not', and 'verändert' is the past participle of 'verändern' (to change). So 'unverändert' (unchanged) literally means 'not changed'.
Die Öffnungszeiten sind über die Feiertage unverändert.
The opening hours are unchanged over the holidays.
'Unverändert' (unchanged) can stand as an adjective before a noun or be used as an adverbial modifier with verbs like 'bleiben' (to remain) or 'lassen' (to leave). It then describes a constant state.
Der unveränderte Plan wurde allen vorgestellt.
The unchanged plan was presented to everyone.
'Unverändert' (unchanged) is especially often combined with the verb 'bleiben' (to remain). The phrase 'unverändert bleiben' (to remain unchanged) emphasizes that a state has not changed over a period of time.
Die Preise für das Produkt sind seit letztem Jahr unverändert geblieben.
The prices for the product have remained unchanged since last year.
immediate / same
'gleich' and 'unverändert' can both express that something is not different. 'gleich' is often used when comparing two things: they look the same or have the same size. It can also mean that something has remained the same. 'unverändert' puts stronger emphasis on a state over time: something was that way before and is still that way now. Learners may confuse the words because both can mean 'not different'. If you mean a comparison between two things, 'gleich' fits better. If you want to say that nothing has changed, 'unverändert' is more precise.

Trotz der neuen Regeln ist der Preis unverändert geblieben.
Despite the new rules, the price has remained unchanged.
Die beiden Schlüssel sehen fast gleich aus.
The two keys look almost the same.