virile

Originally meaning "of a man," virile is used for qualities traditionally linked with masculinity, such as physical strength, energy, and sexual power. It is most often used to describe a man, especially one seen as strong, healthy, and sexually active. The word can also describe a style, voice, or appearance that feels boldly masculine. Be careful, though: it has an old-fashioned tone in some contexts, especially if it sounds like you are judging someone only by sexual appeal.

The word virile comes from the Latin "vir," meaning man, and it originally referred to qualities connected with manhood, such as strength, courage, and sexual power. In modern English, it still keeps that connection. It usually describes a man who seems physically strong, full of energy, and sexually potent.

The word can also be used more broadly for things that seem strongly masculine in character. For example, people may speak of a virile voice, a virile face, or virile writing if it feels forceful, bold, and masculine. That broader use exists, but it is still tied to the idea of masculinity; it is not a general word for anything lively or effective.

It is also common for dictionaries to mention sexual potency as a central part of the meaning, especially when the word describes a man directly. Because of that, the word can sound old-fashioned, literary, or slightly formal, depending on the context. In everyday speech, people may choose simpler words like "masculine," "strong," or "sexually active" instead.

So, this is a word about masculine strength and sexual vitality, not just general energy. It works best when that masculine sense is important to the meaning.