Ways to say it
| Arabic | Romanization (Wiktionary) |
|---|---|
| لَا أَعْلَمُ | lā ʔaʕlamu |
| لَا أَعْرِف | lā ʔaʕrif |
| لَسْتُ أَدْرِي | lastu ʔadrī |
| لَا أَدْرِي | lā ʔadrī |
In Arabic, the choice of how to say "I don't know" depends on what specifically you lack knowledge of. Use لَا أَعْلَمُ when you lack specific factual information or data. Use لَا أَعْرِف when you are not acquainted with a person, a place or a specific concept.
Which one should you use?
While all forms express a lack of knowledge, لَا أَعْلَمُ is used for missing facts, whereas لَا أَعْرِف is used for a lack of familiarity or recognition.
Is there a formal and an informal way to say it?
To express yourself formally, you can use لَا أَعْلَمُ, لَا أَدْرِي or the phrase أنا لا أعلم. The form لَا أَدْرِي is considered a standard and slightly more literary way to express ignorance than everyday spoken dialects.
Is it said differently in some regions?
Different dialects offer informal ways to express this. In Egyptian Arabic, use مش عارف to say you don't know something. In Levantine Arabic (specifically Lebanon, Syria and Jordan), ما بعرف is used to convey uncertainty. In Tunisian Arabic, the informal expression ما عنديش فكرة means "I don't have an idea".
How does it change in a sentence?
In the phrase لَا أَعْلَمُ, the prefix لَا functions as a negation particle for the present tense verb.
How do you pronounce it?
lā ʔaʕlamu
Did you know?
- In many Arabic dialects, people often answer a question with الله أعلم meaning 'God knows best' instead of a direct 'I don't know'.
- The root of the word أعرف comes from عَرَفَ, which is related to the English word 'tariff' via the Arabic 'arafa' regarding recognition and value.
- While لَا أَعْلَمُ sounds very polite and academic, using it in a casual setting with friends might make you sound like a character from a historical television drama.
Examples in context
- عفوًا، ولكن لا أعلم الجواب على هذا السؤال.Excuse me, but I don't know the answer to that question.
- معذرة، ما عنديش فكرة.Sorry, I don't have any idea.
- لَا أَعْلَمُ أَيْنَ هِيَ.lā a‘lamu ayn hiya.I don't know where she is.
- لَا أَعْلَمُ مَتَى سَيَبْدَأُ.lā a‘lamu matā sayabda'u.I don't know when it will start.
- لَا أَعْلَمُ السَّبَبَ الْحَقِيقِيَّ.lā a‘lamu as-sababa al-haqīqiyya.I don't know the real reason.
Example conversation
Ziyad and Nour are looking for a specific book in a library.
- زياد Ziadيَا نُور، هَلْ تَعْرِفِينَ أَيْنَ كِتَابُ التَّارِيخِ؟ya Nour, hal ta'rifina ayna kitab al-tarikh?Nour, do you know where the history book is?
- نور Nourلَا أَعْلَمُ، لَمْ أَرَهُ هُنَا.la a'lamu, lam arahu huna.I don't know, I haven't seen it here.
- زياد Ziadهَلْ نَسْأَلُ أَمِينَ المَكْتَبَةِ؟hal nas'alu amin al-maktaba?Should we ask the librarian?
- نور Nourنَعَم، هَذِهِ فِكْرَةٌ جَيِّدَةٌ.na'am, hadhihi fikratun jayyida.Yes, that is a good idea.
Sources
- Wiktionary, “I don't know” translations, CC BY-SA 4.0, dump of 2026-09-26.
