1.
as expected, sure enough
Indicates that something turned out just as one expected or feared. Often used when confirming a prediction.
2.
really, indeed (rhetorical)
Used in questions to express doubt or wonder about whether something is truly the case. Adds a rhetorical or contemplative tone.
Usage
Sense 1 (as expected) typically appears in narrative or reporting contexts, confirming something that was anticipated. It often pairs with past-tense statements.
Sense 2 (really?) appears in questions, often with だろうか or のか, adding a contemplative or skeptical nuance. Common in essays, speeches, and inner monologue.
Etymology
From the verb 果たす (to fulfill, to carry out). The て-form became fixed as an adverb meaning "as a result" or "in the end."
Related Words
Related:
果たす (to fulfill (etymology))
Synonym:
やはり (as expected (casual))
Synonym:
案の定 (as expected)