Literally, no tener pelos en la lengua imagines a tongue without hairs that get in the way when speaking. The image is deliberately strange: it shows a free mouth, without restraint. Figuratively, it describes a person who speaks with a lot of sincerity and says what they think without softening it. If someone sees a problem, they point it out; if something seems wrong to them, they say it to your face. In a comment about personality, it may appear alongside other modismos that describe character, as in: Mi tía no tiene pelos en la lengua, así que siempre dice lo que piensa.

It is used for people who speak frankly and don’t beat around the bush. Quien no tiene pelos en la lengua no oculta su juicio ni intenta hacerlo más amable de lo necesario. Puede decir: El jefe no tiene pelos en la lengua: le dijo al equipo que el informe estaba mal hecho. The expression presents the person as direct, clear, and unafraid to make others uncomfortable. It can also sound admiring when that honesty seems genuine, as in Ir al Grano, or more critical when the way of speaking turns out to be too harsh.

Appears mainly in informal conversations and in personal comments about friends, family, bosses, or public figures. It is not an expression for technical texts or for speaking with a lot of distance. In a chat among friends, it may sound normal: María no tiene pelos en la lengua, siempre dice lo que piensa de todos. Depending on the situation, it conveys courage, confidence, or bluntness. If frankness hurts, the phrase may approach a critique for speaking too directly, something that is also seen in expressions such as Meter la Pata.

Uses of frankness in conversation

Usage	Explanation
Direct opinion	Used when someone says what they think without softening it and gets to the point right away.
Sincere criticism	Used to talk about an honest and unfashionable critique even if it may be uncomfortable.
Brave comment	Used when a person dares to speak clearly even if others prefer to stay quiet.
Harsh tone	May sound like frankness a bit dry if the person speaks too bluntly.
Personal confidence	Also used as a compliment when someone speaks with honesty and naturalness.

To say things as they are centers on presenting reality clearly and honestly. No andar con rodeos emphasizes going straight to the point without beating around the bush. No tener pelos en la lengua adds a more personal idea: the person speaks with a very marked frankness, even when their opinion may be uncomfortable. That is why it serves well to describe someone with a strong character or very open in speaking, within topics of Personality and Emotions. In a discussion, No te preocupes, él no tiene pelos en la lengua sounds more concrete than habla claro and more colloquial than a neutral explanation.