atsusa ga taisetsu desu.

to be

Breakdown of atsusa ga taisetsu desu.

• が: subject particle
• 大切たいせつ: important
• 厚あつさ: the thickness of an object

Questions & Answers about atsusa ga taisetsu desu.

What does 厚さ mean here?

厚さ means thickness.

It comes from the adjective 厚い, which means thick, and turns it into a noun meaning thickness or the degree of thickness.

So in this sentence, 厚さ is the thing being talked about: thickness.

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Why is there a さ at the end of 厚い?

The さ is a very common way to turn an i-adjective into a noun that expresses a quality or measurement.

So:

• 厚い = thick
• 厚さ = thickness

This is similar to English patterns like:

• high → height
• deep → depth
• long → length

More Japanese examples:

• 高い → 高さ = height
• 長い → 長さ = length
• 広い → 広さ = width / spaciousness

So 厚さ is literally the thick-ness.

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Why is the particle が used after 厚さ?