中期英語tiren疲れる・弱るto grow weary; to weakenこの語源をもつ英単語tire疲れるtired疲れたtiredly疲れてtiredness疲労tireless疲れ知らずのtirelessly疲れ知らずにtirelessness倦まぬ力tiring疲れるuntireuntired疲れていないuntiring疲れ知らずの
