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シンプルに shinpuru ni
Just plainly — no caveats.
What does shinpuru ni mean?
Officially it means simply. Young speakers use it to strip away every hedge: no analysis, no buts, just the verdict.
Example
その映画、シンプルに面白かった。
That movie was just plain good.
Vibe
Who you can say this to, and how it lands.
Friends only Casual. Natural with friends, out of place at work or with strangers.
The story behind shinpuru ni
Grammatically this should describe how something is done. Explain it simply, keep it simple. Young speakers moved it to the front of the sentence and pointed it at themselves instead, so it now describes how the speaker is delivering the verdict rather than the thing being judged.
That move is worth noticing, because Japanese conversation is built to cushion opinions. Layers of maybe, sort of, and it depends are standard courtesy. シンプルに announces that the cushions are being removed on purpose, which makes it feel young, blunt and a little bit brave. It is not a shortcut to a shorter sentence; it is a licence to skip the hedging.