緊密きんみつ
kimmitsu

Noun
na-Adjective

1. rigour; rigor; closeness; compactness; tightly knit

今後こんごとも、貴社きしゃ緊密きんみつなおつきあいをいただけますよう希望きぼうしております。
kongotomo kishato kimmitsuna otsukiaio itadakemasu yōkibō shite orimasu.
I hope that your future activities will expand our relationship with your firm.