You are probably right. But for me "aben" or very close "abend" evening, and "teuer" expensive, make the definition "adventure" very easy to remember. Ever since I was a young man I have always used the farewell phrase of "Always an adventure!" After any excursion with my friends. Now I am wondering how to translate that. Immer eine abenteuer! Probably got it all wrong, again. The Germans undoubtedly have a similar parting phrase or idiom that means the samething.