彼、もうこれ以上努力しても無駄だって思い詰めてた

N5 彼 kare he N5 もう mou already / more N5 これ kore this, this one N4 以上 ijou more than, above, that is all N3 努力 doryoku great effort, exertion, endeavor N3 無駄 muda waste, useless, futile N3 だって datte but, because, even

N3 彼 hi / kare, kano, ka.no he, that, the N4 以 i / motsu.te by means of, because, in view of N5 上 jou, shou, shan / ue, -ue, uwa-, kami, a.geru, -a.geru, a.garu, -a.garu, a.gari, -a.gari, nobo.ru, nobo.ri, nobo.seru, nobo.su, tatematsu.ru above, up, au-dessus N3 努 do / tsuto.meru toil, diligent, as much as possible N4 力 ryoku, riki, rii / chikara power, strength, strong N3 無 mu, bu / na.i nothingness, none, ain't N1 駄 da, ta burdensome, pack horse, horse load N4 思 shi / omo.u, omoera.ku, obo.su think, penser, pensar N2 詰 kitsu, kichi / tsu.meru, tsu.me, -zu.me, tsu.maru, tsu.mu packed, close, pressed

N5 〜もう mou Indicates recent completion or change, equivalent to already, shows action completed before now N4 〜し shi Indicates multiple reasons or qualities, connects clauses or adjectives, means besides that, and also N5 〜も mo Means also, adds another similar item, often replaces particles such as wa ga or o