Which term describes someone who is habitually lazy?

The term "indolent" accurately describes someone who is habitually lazy. Derived from the Latin word 'indolens', which means 'free from pain', indolent specifically conveys a sense of an intentional reluctance to exert oneself or engage in activity. It's a more formal term often used in literature or psychology to characterize chronic laziness or inactivity, implying a deeper, almost ingrained tendency to avoid effort.

While "slothful" also describes laziness, and can often be synonymous with indolent, it draws more on the metaphor of the sloth animal and may carry a slightly different connotation of sluggishness or laziness rather than the habitual aspect.

"Idle" refers to being inactive and can suggest a temporary state rather than a consistent habitual behavior. It doesn't inherently carry the judgment of laziness that indolent does.

"Complacent" refers to a state of self-satisfaction, especially when combined with unawareness of actual deficiencies and may not directly denote laziness. It suggests a contentment with one's situation without the nuances of habitual laziness.

Thus, "indolent" is the most precise term for describing someone who is habitually lazy.