no-nonsense 大真面目な

no-nonsense はおふざけなしの、大真面目な、という意味です。 0:19 Toya's no-nonsense attitude made her a national celebrity and earned her the title 'Mom of the Century.' トーヤさんの息子に対する厳しい態度が彼女をセレブにした。また彼女は世紀の母の称号も手に入れた。

Mom Seen Smacking Son at Baltimore Riots Are Making Life Changes One Year Later
https://www.youtube.com/watch?v=eEkF40iyb78  0:03 Judge Judith Sheindlin, known to most as Judge Judy, made a name for herself with her no-nonsense attitude, tough talk and long belittling lectures she gives to people who appear before her.
The Untold Truth Of Judge Judy
https://www.youtube.com/watch?v=_Z45FmS7u6w  2:15 no-nonsense Peggy Carter ペギー・カーター本人
Marvel's 'Agent Carter': Sneak Peek
https://www.youtube.com/watch?v=U9F4SEU_W4M  0:51 This no-nonsense brown bull breaks away, and shows the runners, just who the boss is here. マジ切れている牛
Three People Gored in Annual Pamplona Bull Run