
vergeblich
futile
Without the desired success or hoped-for result; in vain.
All seine Bemühungen, sie umzustimmen, waren vergeblich.
All his efforts to change her mind were futile.
futile
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futile
Without the desired success or hoped-for result; in vain.
All seine Bemühungen, sie umzustimmen, waren vergeblich.
All his efforts to change her mind were futile.
'Vergeblich' (futile/in vain) is very often used as an adverb to describe an action that remains unsuccessful. In that case, it usually comes directly after the conjugated verb.
Ich habe vergeblich versucht, ihn zu erreichen.
I tried in vain to reach him.
As an adverb, 'vergeblich' (in vain) often appears together with verbs that express an effort or expectation. Typical combinations are 'vergeblich warten' (to wait in vain), 'vergeblich suchen' (to search in vain), and 'vergeblich hoffen' (to hope in vain).
Wir warteten vergeblich auf eine Antwort.
We waited in vain for an answer.
You can also use 'vergeblich' (futile) with the verb 'sein' (to be) to express that an effort or attempt was in vain. The structure is then: 'Etwas ist/war vergeblich' (something is/was futile).
Seine ganze Mühe war am Ende vergeblich.
All his effort was futile in the end.
free / in vain
Both words describe an attempt without the desired result. Umsonst is common in everyday speech, but it can also mean “free,” which may make it ambiguous. Vergeblich is unambiguous in this context. When only the lack of success is meant, vergeblich is therefore often more precise.

Wir suchten eine Stunde lang nach dem Schlüssel, aber die Suche war vergeblich.
We spent an hour looking for the key, but the search was futile.
Wir suchten eine Stunde lang nach dem Schlüssel, aber die Mühe war umsonst.
We spent an hour looking for the key, but our effort was in vain.