What is a false friend in language learning?
A false friend is a word that looks or sounds like a word in your own language but means something different. They are dangerous precisely because they feel familiar — you recognise them, so you do not look them up.
The technical term is false cognate in loose usage, though strictly a false cognate is a word that resembles another by coincidence with no shared origin, while most false friends are genuine relatives whose meanings drifted apart.
Classic examples:
Spanish embarazada means pregnant, not embarrassed.
French actuellement means currently, not actually. French librairie is a bookshop; a library is a bibliothèque.
German Gift means poison. German bekommen means to receive, not to become.
Italian morbido means soft.
Portuguese puxe on a door means push in English pronunciation but actually means pull.
Japanese manshon means an apartment block, not a mansion.
Why they exist. Most arise from semantic drift: two languages borrow the same Latin or Germanic root and the meaning narrows, broadens or shifts in one of them. English actual kept the sense of real; French kept the sense of present-day, which was also once available in English.
Partial false friends are the harder case — words that overlap in some senses and not others. English control and Spanish controlar agree in some contexts and diverge in others, so the word works often enough to build false confidence.
English speakers face a specific version of this. English has borrowed so heavily from French and Latin that European languages appear more transparent than they are.
Practical defence: be most suspicious of words you are most confident about, verify anything abstract or formal-sounding, and note that false friends cluster in academic and bureaucratic vocabulary rather than everyday words.