(graph theory) undirected graph (graph in which the edges are not ordered)

plural of grafo não-orientado

dead men tell no tales (killing someone is the best way to keep them quiet)

non-governmental organisation (organisation with no government participation)

forget-me-not (plant of the genus Myosotis)

Alternative form of não-me-esqueças

Used other than figuratively or idiomatically: see não, me, diga. / you don't say (expression of surprise; often used sarcastically to express that an affirmation was obvious)

Alternative form of persona non grata

Used other than figuratively or idiomatically: see por que, não. / why not (used to state one has no objection) / why not (used to introduce a proposal)

(literary theory) unreliable narrator (narrator who provides questionable information)