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さも

as if; seemingly

s a̠ m o̞
さ -ness (the degree or quality of an adjective) + も Also / even
adverb Rare #34,403
as if; seemingly Often used before ように or そうに to describe something that appears to be the case.
JA: 彼はさも自分が正しいかのように話した。
EN: He spoke as if he were right.

急げ、さもないと列車に乗り遅れるよ。

Hurry up, or you'll miss the train.

これっぽっちも思ってないこともさもそれらしく演じてみせるだろ

You can make yourself seem convincing even when you don't believe it in the slightest, can't you?

— オープン・ユア・アイズ (1997)

（ポルコ）さもねえとみな殺しにしてやるぜ

Otherwise, I'll kill every last one of you.

— 紅の豚 (1992)

さも真実らしく嘘をつく

To lie convincingly.

— ８ 1／2 (1963)

Sounds similar to

さま s a̠ m a̠