I think it "ineffective" when her hand touch stuff, like she's making a wave to control them or something. Here the full sentence "この力は触れていると無効なのでいちいち脱ぐ必要がありますが", the "無効" is ineffective right?
I translate these by running them into DeepL and GoogleTranslate then mix them together, improve it...
Y’all should argue in Twitter r something, if u hate the manga don’t read it, simple trick mangareader don’t know!
Also if u hate that mc weak than read those isekai with cheat lol