Similar words
mystérieux
Close — "a deep mystery" relates to something profound and mysterious.
Similar in other languages
German
tief
tief is the German word for the same thing — both mean "deep."
Spanish
hondo
hondo is the Spanish word for the same thing — both mean "deep."
Spanish
profundo
profundo is the Spanish word for the same thing — both mean "deep."
Practice
1 What does profond mean?
deep
2 Fill the gap: Ce lac est très ___ au centre.
Full sentence: Ce lac est très profond au centre. (This lake is very deep in the middle.)
3 Which fingerprint chart matches profond?
profond: neutral register, core frequency, general domain, neutral connotation.