The definition of a stickler is someone who adheres tightly to a set of rules or principles.
A teacher who gives you detention if you are even a minute late is an example of someone who is a stickler for tardiness.
- a person who insists on the strict observance of something specified: usually with for: a stickler for discipline
- Informal something puzzling or difficult to solve
Origin of sticklersee stickle
- One who insists on something unyieldingly: a stickler for neatness.
- Something puzzling or difficult.
From stickle +"Ž -er.