

Attention, le lac est très profond ici.
[atɑ̃sjɔ̃, lə lak‿ ɛ tʁɛ pʁɔfɔ̃ isi.]
Careful, the lake is very deep here.
Les enfants ne nagent pas dans l'eau profonde.
[lez‿ ɑ̃fɑ̃ nə naʒ pa dɑ̃ lo pʁɔfɔ̃d.]
The children don't swim in deep water.
J'ai dormi d'un sommeil profond cette nuit.
[ʒe dɔʁmi dɛ̃ sɔmɛj pʁɔfɔ̃ sɛt nɥi.]
I slept deeply last night.
"profond" is in the lesson "Adjectives 6" (Level 40), along with 10 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.