The difference between Autonomous and Self-directed

Autonomous as an adjective:

Self-governing. Intelligent, sentient, self-aware, thinking, feeling, governing independently.

Autonomous as an adjective:

Acting on one's own or independently; of a child, acting without being governed by parental or guardian rules.

Autonomous as an adjective (Celtic linguistics, of a verb form):

Used with no subject, indicating an unknown or unspecified agent; used in similar situations as the passive in English (the difference being that the theme in the English passive construction is the subject, while in the Celtic autonomous construction the theme is the object and there is no subject).

Self-directed as an adjective:

Directed, independently by oneself without external control or constraint