If someone is adamant about something, they are determined not to change their mind about it.
①And why was the president so adamantly against this bill?
②Mr. Putin spokesman is adamant that the Kremlin is not involved.
这个词的搭配一般为：be adamant about或者be adamant that~
《大西洋月刊》一篇题为 The last of the nice negro girls 也出现了这个表达：
[scode type="blue"]on all fours
If you are on all fours, your knees, feet, and hands are on the ground.
She crawled on all fours over to the window.
Romain Gary的小说 Promise at Dawn 也出现了这个表达：