〜もそこそこに
barely (finishing), hurriedly cutting short
Noun (挨拶, 食事, 準備) + もそこそこに
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もそこそこに means cutting something short, doing only the bare minimum because you're in a hurry to get to something else: 挨拶もそこそこに、本題に入った, "with barely a greeting, he got straight down to business".
The noun is something you'd normally do properly: 挨拶, 食事, 朝ご飯, 仕事, 宿題, 準備. The second half is the rush to the next thing: leaving, getting started, going out to play.
そこそこ on its own means "so-so, reasonably": そこそこおいしい. With も〜に, it becomes "only half-done".
Compare も構わず (N2), "without caring about", which ignores something completely.
Examples
挨拶もそこそこに、彼は本題に入った。
With barely a greeting, he got straight down to business.
朝ご飯もそこそこに、家を飛び出した。
I rushed out of the house, barely touching my breakfast.
彼は仕事もそこそこに、飲みに出かけた。
He knocked off work early and went out drinking.
息子は宿題もそこそこに、遊びに行ってしまった。
My son rushed through his homework and went off to play.
準備もそこそこに、会議が始まった。
The meeting started before we'd barely prepared.