What is the meaning of Sodeyn?

Sudden; happening or developing without buildup or non-gradually.

Unanticipated; happening or developing without warning or notice.

Hasty; happening or developing in a quick or fast way.

Impulsive; happening or developing as a result of a poorly-thought decision.

Ephemeral; short-lived or impermanent.

Source: wiktionary.org

See also