laches

詳細解釋：

lach.es

n.（名詞）
Negligence or undue delay in asserting a legal right or privilege.
怠慢罪：忽視或不至魯莽的延遲以主張某個法律上的權利或是利益

來源：
Middle English [slackness, negligence]
Middle English [slackness, negligence]
from Anglo-Norman lachesse, laches
from Anglo-Norman lachesse, laches
from Old French laschesse
from Old French laschesse
from lasche [loose, remiss] * see lush
from lasche [loose, remiss] *參見 lush