This is the 11827th most frequent German word.
teufl
"Teufl" is not a standalone German word; it might be a truncation of "teuflisch," which means "devilish" or "diabolical."
'Teuflisch' in this context describes something evil or malicious, deriving from 'Teufel' (devil).
Seine teuflischen Pläne wurden vereitelt.
His diabolical plans were foiled.
'Teuflisch' here is used colloquially to intensify the adjective 'gut' (good), giving an extra emphasis.
Das Konzert war einfach teuflisch gut!
The concert was just devilishly good!
'Teuflisch' conveys a characteristic or association related to the devil in a metaphorical sense, adding a mysterious or dark nuance.