(idiomatic, litotes, understatement) Misbehaving, being mischievous.

(idiomatic) Something ordinary or run-of-the-mill. / (idiomatic) Nothing worth discussing; nothing that the speaker wants to mention.

(idiomatic) To lack support, as in an argument, debate, or negotiation.

Alternative spelling of non-governmental organization

(set theory) A mathematical notation for describing a set by specifying the properties that its members must satisfy.

Alternative spelling of nonstandard

(pharmacology) Alternative spelling of nonsteroidal anti-inflammatory drug

The name of an assembly or gathering of similar things or people.

The name of something that contains many individual things or people. Examples: army, fleet, hundred.

(UK law) A declaration from the attorney general ending a criminal prosecution. / (law) A proceeding or declaration by which a plaintiff or prosecutor ends a legal suit.