I think his behavior is outrageous.

Kou is always tackling everything with a high-spirited attitude.

This software maintains backward compatibility.

He can speak Scots.

Gaelic is the traditional language of Ireland.

I have started learning Korean language.

This book contains a lot of rare words.

He fell into a deep sleep and was muttering in his sleep.

He was sleeping while sleeptalking.

This new word is a portmanteau, combining two words.