～くなかった | Grammar

Structure

Replace ～い with ～くなかった to form the negative past tense.

たかい高い → 高くない → 高くなかった

Polite Form: To make the i-adjective polite, add です to the plain negative form:

たかくなかった高くなかった → 高くなかったです

Exceptions:

よい良い (いい) → 良くなかった (よくなかった)
The same pattern applies to other adjectives ending in よい良い (いい), such as かっこいい → かっこよくなかった

Description

The ～くなかった form is the plain negative past tense of i-adjectives in Japanese. It is used to describe qualities or states that did not apply in the past.

Negative Past: Indicates that a quality or state was not true or did not occur in the past.
きのう昨日のてんき天気はさむくなかった寒くなかった。
Yesterday's weather was not cold.
Polite Form: Add です to make the statement polite and suitable for formal contexts.
そのりょうり料理はおいしくなかったです。
That dish was not tasty.

Examples

。

Yesterday's weather was not cold.

。

This book was not expensive.

。

That dish was not tasty.

。

The hotel room was not spacious.

。

The movie was not interesting.

。

Yesterday's weather was not cold.

。

This book was not expensive.

。

That dish was not tasty.

。

The hotel room was not spacious.

。

The movie was not interesting.