I really think he's a dimwit.

The summer vacation ended in the blink of an eye.

He is an intersex person, possessing both male and female gender characteristics.

Interstellar travel is still a realm of dreams for mankind.

This book has beautifully colored interleaves.

The doctor said there is a problem with my interosseous.

The intercharacter space in this text is too wide, making it hard to read.

The gutter of this book is too wide, making it hard to read.

My apartment is covered with a relatively small tatami mat.

My room is made of Edo-style tatami mats.