The equitable principle that a court may decline relief to a person who has slept on his rights and approached the court after unreasonable and unexplained delay, where that delay has prejudiced the other side or settled rights have arisen. "Laches" means negligent or undue delay.
It explains why courts may reject otherwise valid writ petitions filed late; a clean concept paired with writs, judicial review and limitation.
Laches (equitable, discretionary delay) is not the same as statutory limitation (fixed periods under the Limitation Act); laches can bar relief even where no limitation period is prescribed.
Courts may deny relief for unreasonable, unexplained delay; equity aids the vigilant, not those who sleep on their rights.