
ungeahnt
unexpected
Describes something that one did not expect or foresee, often to a surprisingly large or positive extent.
Das Projekt entwickelte eine ungeahnte Eigendynamik.
The project developed an unexpected momentum of its own.
unexpected
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unexpected
Describes something that one did not expect or foresee, often to a surprisingly large or positive extent.
Das Projekt entwickelte eine ungeahnte Eigendynamik.
The project developed an unexpected momentum of its own.

hidden
Refers to abilities, talents, or possibilities that had previously been hidden and are only now coming to light.
In ihr schlummern noch ungeahnte Talente.
There are still hidden talents lying dormant in her.
The word consists of the negation 'un-' and 'geahnt', the past participle of 'ahnen' (to suspect/sense). 'ahnen' means to have a premonition of something or to suspect something. 'ungeahnt' therefore describes something completely unexpected or unforeseen.
Durch die neue Technologie ergaben sich ungeahnte Möglichkeiten.
The new technology opened up unexpected possibilities.
'ungeahnt' (unexpected) is almost always used directly before a noun (attributively). It emphasizes the surprising nature or surprising extent of something and gives the statement a certain drama.
Der kleine Fehler hatte ungeahnte Konsequenzen für das ganze Unternehmen.
The small mistake had unexpected consequences for the entire company.
When referring to people, 'ungeahnt' (hidden/unexpected) is often used for positive, hidden qualities. Typical combinations are 'ungeahnte Talente' (hidden talents), 'ungeahnte Kräfte' (unexpected strength), or 'ungeahnte Fähigkeiten' (hidden abilities).
Unter dem Druck der Situation entdeckte sie ungeahnte Kräfte in sich.
Under the pressure of the situation, she discovered unexpected strength within herself.
unexpected
Unerwartet and ungeahnt both describe something that one did not expect. Unerwartet mainly states that something is surprising. Ungeahnt often additionally emphasizes that a scale or development is surprisingly large or positive.

Nach dem Bericht erreichte die Nachfrage ein ungeahntes Ausmaß.
After the report, demand reached an unexpectedly large scale.
Nach dem Bericht stieg die Nachfrage unerwartet an.
After the report, demand rose unexpectedly.