ぐにでも
suguni demo

Expression

1. right away; without delay; as soon as possible; very soon

Usually Written in Kana
もし かれ住所 じゅうしょ っていれば、すぐにでも連絡 れんらくするのだが。
moshi kareno jūshō shitte ireba sugunidemo renraku suru nodaga.
If I knew his address, I would get in touch with him right away.