inept at 劣る

inept は adept の反対語です。 0:48 despite years spent studying the language at school, many Japanese feel inept at English. 学校で何年も英語を勉強したのに、日本人は自分たちが英語が下手だとおもっている。

Japanology Plus 2015 07 16 English Conversation Business
https://www.youtube.com/watch?v=Gmh2Nfsl03k  0:52 there was also wide-spread anger against politicians seen as corrupt and inept.
Bulgaria's political crisis poised to end https://www.youtube.com/watch?v=9YdObQu02SE  4:56 ants are really very inept. アリの仕事は非効率極まりない。
Adventures among ants https://www.youtube.com/watch?v=830f8XLG70Q  1:7 inept officials or workers.
Greek PM: Talks on New Bailout Package Under Way