na-adjective
implicit; tacit
Used in computing and formal contexts for something understood without being directly stated, such as an implicit assumption or default behavior.
この設定は暗黙的に有効になっています。
This setting is implicitly enabled.
暗
There was a tacit understanding.
暗黙 is a noun meaning 'tacitness' or 'implicitness', often used in compounds like 暗黙の了解 (tacit understanding). 暗黙的 is the adjectival form.
Compound of 暗黙 (tacit, implicit) + 的 (-like, -ish), forming an adjectival noun. 暗黙 itself is from 暗 (dark, hidden) and 黙 (silent).