けっ決keしてshiteけ決keしてshite
1.
An adverb used to strongly emphasize a complete denial or prohibition, often paired with negative expressions to convey an unwavering refusal or impossibility.
2.
Used to indicate a sentiment of total negation, signifying that under no circumstances should something occur or be accepted.
3.
An expression that conveys a feeling of absolute certainty in a negative sense, suggesting that despite any circumstances, an action or situation should never happen or be tolerated.
4.
A term that can also imply a partial denial, indicating that while some aspects may be true, the whole should not be viewed in that light.
Example:
アンディはけっしてデートにおくれたことはない。