厚(あつ)い

あつい

i-adjective

thick

See also: 暑(あつ)い (hot (weather)), 熱(あつ)い (hot (objects))

Conjugation

	Affirmative	Negative
Present	厚(あつ)い	厚(あつ)くない
Past	厚(あつ)かった	厚(あつ)くなかった
て form	厚(あつ)くて	厚(あつ)くなくて
Adverbial	厚(あつ)く	—
Conditional ば	厚(あつ)ければ	厚(あつ)くなければ
Conditional たら	厚(あつ)かったら	厚(あつ)くなかったら

1. thick (not thin)

Describes something with considerable thickness or depth. The opposite of 薄(うす)い (thin). Used for books, walls, slices, etc. Different from 暑(あつ)い (hot weather) and 熱(あつ)い (hot to touch).

この本(ほん)は厚(あつ)いですね。

This book is thick, isn't it?

厚(あつ)い本(ほん)を読(よ)んでいます。

I'm reading a thick book.

この紙(かみ)は厚(あつ)くて、書(か)きやすいです。

This paper is thick and easy to write on.

冬(ふゆ)は厚(あつ)いコートを着(き)ます。

I wear a thick coat in winter.

厚(あつ)い辞書(じしょ)を買(か)いましたが、重(おも)くて持(も)ち運(はこ)びが大変(たいへん)です。

I bought a thick dictionary, but it's heavy and hard to carry around.

Forms

Adverbial: 厚(あつ)く
Noun form: 厚(あつ)さ (thickness)

Common collocations

厚(あつ)い本(ほん): a thick book
厚(あつ)いコート: a thick coat
厚(あつ)く切(き)る: to slice thickly
Figurative (warm, deep): 信頼(しんらい)が厚(あつ)い (deeply trusted), 厚(あつ)く御礼(おれい)申(もう)し上(あ)げます (formal: my heartfelt thanks)

Watch out

Three adjectives are read あつい:

厚(あつ)い: thick (a book, a wall)
暑(あつ)い: hot (weather, a room)
熱(あつ)い: hot to the touch (tea, a stove)

Similar words

薄(うす)い: thin — the opposite
分厚(ぶあつ)い: very thick, bulky — more emphatic

Related Words

Antonym: 薄(うす)い (thin)

Related: 分厚(ぶあつ)い (very thick (emphatic))

Related: 厚(あつ)さ (thickness (noun form))

Compare: 肉厚(にくあつ) (thick)

basic

Added 2026.1.7 21:56 · Revised 2026.9.30 22:08

00500/00690_atsui