没头没脑 (méi tóu méi nǎo) — abruptly, without rhyme or reason (describing an action); completely at a loss, baffled (describing a state of mind)

Definition

An idiom with two very different uses: as 副 it describes an action done 副 (abruptly, for no reason); as 形 it describes a person left 副 (baffled, at a loss).

idiom
abruptlywithout rhyme or reason (describing an action)completely at a lossbaffled (describing a state of mind)

Examples

  • 没头没脑。
    Tā méi tóu méi nǎo dì mà le wǒ yí jù jiù zǒu le.
    He cursed me without any reason and left.
  • 没头没脑，。
    Wǒ bèi zhè ge wèn tí wèn dé méi tóu méi nǎo, bù zhī dào gāi zěn me huí dá.
    This question left me completely at a loss; I didn't know how to answer.
  • 没头没脑，。
    Zhè jiàn shì fā shēng dé méi tóu méi nǎo, shuí yě méi xiǎng dào.
    This thing happened out of nowhere; no one expected it.

Origin

Compound word
构词法gòucífǎ
联合liánhéSide by side

Two parts of equal weight, alike or opposite in meaning, standing side by side.

没头without head
没méiwithout头tóuhead
动宾Verb + object
没脑without brain
没méiwithout脑nǎobrain
动宾Verb + object

没头 and 没脑 are set side by side, suggesting a lack of 头 and 脑, hence abruptness or bewilderment.

Characters in this word

Most characters — around four in five — are built this way: one part hints at the meaning, the other at the pronunciation.

This origin belongs to the traditional form 沒; 没 is its simplified writing.

Meaning part形符xíngfú
水水shuǐwater
Sound part声符shēngfú
𠬛
𠬛𠬛沒mò
The sound has drifted apartThe sound part was a clue two thousand years ago — it often still helps, but not always.

The traditional form 沒 pairs 水 (water) with 𠬛 as a sound part; this note is about 沒, not the simplified 没.

Open 没 →

Most characters — around four in five — are built this way: one part hints at the meaning, the other at the pronunciation.

This origin belongs to the traditional form 頭; 头 is its simplified writing.

Meaning part形符xíngfú
頁頁yèhead
Sound part声符shēngfú
豆
豆dòu頭tóu
Close in sound todayThe sound part was a clue two thousand years ago — it often still helps, but not always.

The traditional form 頭 shows 頁, meaning head, beside 豆 as a sound component; the simplified 头 is a later shorthand.

Open 头 →

Most characters — around four in five — are built this way: one part hints at the meaning, the other at the pronunciation.

This origin belongs to the traditional form 沒; 没 is its simplified writing.

Meaning part形符xíngfú
水水shuǐwater
Sound part声符shēngfú
𠬛
𠬛𠬛沒mò
The sound has drifted apartThe sound part was a clue two thousand years ago — it often still helps, but not always.

The traditional form 沒 pairs 水 (water) with 𠬛 as a sound part; this note is about 沒, not the simplified 没.

Open 没 →

Two or more meaningful parts placed together so that their meanings combine into a new one.

This origin belongs to the traditional form 腦; 脑 is its simplified writing.

  • 匕匕bǐ
  • 巛巛chuānhair
  • 囟囟xìnhead; fontanel

In the traditional form 腦, the older part 匕 was replaced by a flesh part, while 巛 (hair) and 囟 (head; fontanel) stayed. The simplified 脑 is a later abbreviation.

Open 脑 →

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