na-adjective
fateful; predestined
Describes events, encounters, or outcomes that seem determined by fate or destiny. Often carries a dramatic or philosophical tone.
あの出会いは宿命的だった。
That encounter was fateful.
彼の成功は宿命的なものに思えた。
His success seemed like something predestined.
Derived from 宿命 (fate, destiny) + the adjectival suffix 的. The exact historical derivation of 宿命 is uncertain, but it is conventionally associated with the concept of predetermined fate.