御構いなく[okamainaku] please don't fuss over me
サーボ機構[saabokikou] servomechanism
シフト演算機構[shifutoenzankikou] shift arithmetic unit
ヒグス機構[higusukikou] Higgs mechanism (physics)
遺構[ikou] remains

一向に構わない[ikkounikamawanai] doesn't care at all
一般命令演算機構[ippanmeireienzankikou] general instruction unit (computer)
機構[kikou] mechanism
気構え[kigamae] readiness
虚構[kyokou] fiction

隈無く[kumanaku] all over
然り気無い[sarigenai] nonchalant
だらし無い[darashinai] slovenly
途轍も無い[totetsumonai] extravagant
とんでも無い[tondemonai] unthinkable

無け無し[nakenashi] very small amount which looks like nothing
無駄にする[mudanisuru] to render futile
悪虐無道[akugyakubudou] treacherous
意気地無し[ikujinashi] coward
一も二も無く[ichimonimonaku] unhesitatingly