verändert
changed
Different than before; having undergone a change.
Nach dem langen Urlaub wirkte er erholt und positiv verändert.
After the long vacation, he seemed rested and positively changed.

changed
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changed
Different than before; having undergone a change.
Nach dem langen Urlaub wirkte er erholt und positiv verändert.
After the long vacation, he seemed rested and positively changed.

'Verändert' (changed) is the past participle of the verb 'verändern' (to change). It is used like an adjective and describes a state that is the result of a change. The prefix 'ver-' often indicates a change of state here.
Seine Einstellung hat sich komplett verändert.
His attitude has changed completely.
The adjective 'verändert' (changed) is often described more precisely by adverbs. Common combinations are 'stark verändert' (greatly changed), 'kaum verändert' (hardly changed), 'positiv verändert' (positively changed), or 'grundlegend verändert' (fundamentally changed).
Seit ihrer Reise wirkt sie positiv verändert.
Since her trip, she seems positively changed.
'Verändert' (changed) often appears after verbs like 'sein' (to be), 'wirken' (to seem), or 'aussehen' (to look) to describe the new state of a person or thing. It always implies a comparison with an earlier state.
Nach dem Umbau sieht das Haus völlig verändert aus.
After the renovation, the house looks completely changed.
new
'neu' and 'verändert' can both mean that something is no longer the way it was before. 'neu' often emphasizes the result: now there is a different form, a different rule, or a different situation. 'verändert' emphasizes the process or the comparison with earlier more strongly: something has remained the same thing, but it looks different or works differently. If something has been completely replaced, 'neu' fits better. If the same thing has been adjusted, 'verändert' sounds more precise.

Max hat den Reiseplan verändert, weil der Zug ausfällt.
Max changed the travel plan because the train is canceled.
Für die Anmeldung gibt es jetzt ein neues Formular.
There is now a new form for registration.