甚

အွန်

ジン

ခွန်

はなは(だしい)

甚だしい（はなはだしい）

extreme

On-reading (ジン) is used in compounds; kun-reading (はなは(だしい)) is used standalone or with okurigana. This kanji forms verbs/adjectives with okurigana. Practice both the word form and compound forms.