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formality (:
As the term of the question expresses casualness it could be translated:
'Kaachan, sugoku kieri desu yo'
It means that treating your near and dear ones with casualness, not realizing their worthiness.
No, the word 'casual' is an adjective, a word used to describe a noun (a casual conversation, casualattire).
The abstract noun form of the adjective 'causal' is casualness.
The word 'casual' is a concrete noun as a word for an occasional worker or a soldier temporarily at a station; a word for a person.
The abstract noun form of the adjective 'casual' is casualness.