The grammar of Japanese adjectives
The Japanese language differentiates two types of adjectives to describe a status. I-adjectives are relatively close to the western definition of adjectives with a clear stem and additional attributes. Na-adjectives are originally nouns that can also be used as adjectives. This article describes the grammar for i-adjectives and na-adjectives and provides lists of both for each level of the Japanese Language Proficiency Test (JLPT).
i-adjectives
- The PLAIN FORM of i-adjectives
- The PAST FORM of i-adjectives (-katta)
- NEGATION of i-adjectives (-kunai)
- PAST NEGATION of i-adjectives (-kunakatta)
- The SA FORM of i-adjetives (-sa)
- The SOU FORM of i-adjectives (-sou)
- List of i-adjectives for the JLPT N5
- List of i-adjectives for the JLPT N4
- List of i-adjectives for the JLPT N3
- List of i-adjectives for the JLPT N2
- List of i-adjectives for the JLPT N1
na-adjectives
- The PLAIN FORM of na-adjectives
- The PAST FORM of na-adjectives
- NEGATION of na-adjectives
- PAST NEGATION of na-adjectives
- List of na-adjectives for the JLPT N5
- List of na-adjectives for the JLPT N4
- List of na-adjectives for the JLPT N3
- List of na-adjectives for the JLPT N2
- List of na-adjectives for the JLPT N1
NIHONGO ICHIBAN 
When do you think specifically the forms of na- adjectives will be updated?
In the i adjectives column, the list of kanji for JLPT N4, N3, N2, N1 isn’t working as a link. Please help for the same.
We are still working on it. They currently are just a reminder for us.
Why can’t I click on the links below ‘na-adjectives’ or for a list of adjectives beyond the N5 adjectives? It is just a list, but no clickable links?
These have not been updated yet, we are extremely sorry for the long wait but I hope you understand that we are a free service trying to help people learning Japanese with this material while working on many other projects thus completing these lists takes quite a long time.
Thank you for your comprehension.
I think the PAST NEGATION of i-adjectives (-kunakatta) link are wrong link.
Should it be below link?
https://nihongoichiban.com/2011/05/08/i-adectives-past-negation-kunakatta-form/
Where are the rest of the links? ;o