keistai in English:

Strangely, he passed up her very generous offer.

All day, I have been strangely preoccupied with thoughts of my hometown.

Strangely enough, he failed.

This is strangely addictive!

strangely unsettling

Groaning strangely she is hurling her overflowing passion onto the canvas!

Strangely, rich people tend to be stingier than poor people.

Jim acted very strangely all day.

Pretty soon along came to the village some strangely dressed people who called themselves surveyors; and they surveyed a line in front of my grandmother's little house.

Strangely, the cash register's total was 777 yen.

Strangely, the number of students is decreasing each year.

It was just a simple greeting, but somehow I got strangely tense.

Secondly, and perhaps more strangely, every single one of these airlines, with the exception of Wow Air, stopped flying in either the month of September or October.

Walking around Tokyo, or Osaka, or Kobe, you might notice something odd: a strangely high number of music stores.

Strangely, I seldom see her.