Kakodaimonia is the morphological antonym of TERMεὐδαιμονία: κακο- ("ill") + δαίμων ("guardian spirit, divine principle") + ία (an abstract suffix). Literally, "the state of being with an ill daimōn." In ordinary Greek it means "misfortune" or "calamity"; in Stoic technical ethics the term acquires a specific sense: it is not "bad luck," "illness," or "loss" (all these belong to the indifferents), but a structural condition of the soul in which it does not function as rational — does not monitor itself, is torn between false assents, locates the good in things external. Stoic kakodaimonia is not caused from outside (the external does not bring it about) and does not depart of itself: it is the consequence of specific defects of rational constitution, and is therefore diagnosable and reversible.

SVF III 117–138 (κακία as the opposite of ἀρετή); 377–490 (the doctrine of the πάθη as constituents of kakodaimonia); DL VII 110–115; Stob. Ecl. II 88–93 W; Cic. Tusc. III–IV (the whole — an anatomy of kakodaimonia through the analysis of the passions). The Platonic background: Resp. IX 580a–c (the tyrant as the most kakodaimōn). In Marcus: Med. 2.8; 4.49; 5.34; 9.4.

In 02-08 κακοδαιμονεῖν stands in the closing part of an antithesis: those who do not track the movements of their own soul "are necessarily kakodaimones" (ἀνάγκη κακοδαιμονεῖν). The structural necessity here is not a rhetorical flourish: the Stoics really hold it. If the parameters of TERMεὐδαιμονία are rigidly fixed (the internal coherence of reason, the self-sufficiency of virtue), then their negation automatically yields kakodaimonia.

In different passages Marcus diagnoses different roads into kakodaimonia:

• 02-06 — placing one's own TERMεὐμοιρία in the souls of others (loss of αἰδώς);
• 02-07 — the absence of a σκοπός (drift and circling, see aimless-wandering);
• 02-08 — the absence of παρακολούθησις (self-monitoring);
• Med. 4.49 — the opinion that what is external is evil;
• Med. 5.34 — estrangement from one's own nature.

All these roads reduce to a single structure: a reason that does not function as reason. So the therapeutic logic of the Stoics works in the reverse direction: to remove any one of these defects is to remove the kakodaimonia, because reason is by nature inclined toward eudaimonia and is held in kakodaimonia only by the active maintenance of erroneous assents.