flat-earther

broadly derogatory figuratively

A person who believes or advocates the theory that the planet Earth is flat.

Japanese Meaning

地球が平らであると信じる、または主張する人

As a flat-earther, he dismissed photos from space as elaborate hoaxes and refused to accept scientific explanations.

地球が平らだと信じる人として、彼は宇宙からの写真を巧妙なでっち上げだと一蹴し、科学的な説明を受け入れようとしなかった。

Sense（1）

A person who believes or advocates the theory that the planet Earth is flat.

Sense（2）

Global warming is settled, unless you are a flat earther or an energy company apologist.

flat-earthers

（ plural ）