deeply

This adverb primarily functions as an intensifier for emotional or intellectual states, often replacing "very" or "extremely" in formal or serious contexts. It suggests a level of penetration or permanence, as in "deeply regretted" or "deeply concerned," implying that the feeling is not superficial but reaches the core of a person's being.

When used physically, it describes a movement that extends far down or inward. In the context of breathing, it specifically denotes a full inhalation of air to maximize lung capacity, often associated with relaxation or emotional distress.