Learn the tone, meaning, and better English alternatives around "i've long suspected" with real scene examples.

It means the speaker has believed something was wrong for a while, especially because the other side has stayed silent.
From Collateral Hearts, Episode 14
The speaker says they have been suspicious for a long time because of recent events.
Use this in a serious discussion when you want to say your doubts existed before the current problem. It sounds formal and a little dramatic, so it is less natural in casual conversation.
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