Fatal
な adjective
Somebody doing you fate -al would... probably be pretty fatal!
ちめいてき
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
生徒とのスキャンダルは、彼の教師生命にとって致命的でした。
The scandal with his student was fatal to his teaching career.