rücksichtlos
The big boys were ruthless (mean) to the little boy.
The core word is 'rue', or to regret. So ruthless is without regret, and rueful or ruefully is with regret.
But isn't a German word.
Plick is not a German word.
greave is not a German word.
Rouse is not a German word
"houpacker" means nothing in German; it is not a German word.
That word is not German, sorry.
Oxded is not a German word
Do you mean elan? Then the word exists in German
The German word herr is equivalent to the English word Mister.
Sunna is not a German word. The closest German word is Sonne which translates as sun.