

Mein kleiner Bruder ist manchmal ein echter Teufel.
[ˈmaɪ̯n ˈklaɪ̯nɐ ˈbruːdɐ ˈɪst ˈmançmaːl ˈaɪ̯n ˈɛçtɐ ˈtɔɪ̯fl̩.]
My little brother is a real devil sometimes.
Wenn man vom Teufel spricht, da kommt er!
[ˈvɛn ˈman ˈfɔm ˈtɔɪ̯fl̩ ˈʃprɪçt, ˈdaː ˈkɔmt ˈeːɐ̯!]
Speak of the devil, here he comes!
Sie ist nicht so böse wie der Teufel.
[ˈziː ˈɪst ˈnɪçt ˈzoː ˈbøːzə ˈviː deːɐ ˈtɔɪ̯fl̩.]
She isn't as evil as the devil.
"der Teufel" is in the lesson "Character" (Level 19), along with 12 other useful words. LinDuo has 180 topic lessons like this one, 2,375 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.