絶大

ぜつだい
tremendous
immense

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ぜつだい【絶大】

～な the greatest; tremendous; colossal; stupendous; immense; immeasurable; superb.

●何とぞ絶大なご後援を賜りますようお願い申し上げます. I hope you will give me unstinting support [support me wholeheartedly].