不
negative, non-, bad, ugly, clumsy
On'yomi: フ (fu)、 ブ (bu)
Stroke order
必
invariably, certain, inevitable
On'yomi: ヒツ (hitsu)
Kun'yomi: かなら.ず (kanara.zu)
Stroke order
要
need, main point, essence, pivot, key to
On'yomi: ヨウ (you)
Kun'yomi: い.る (i.ru)、 かなめ (kaname)
Stroke order