deep down (adverb)

1. Deep down, the building's design reflects the owner's love for contemporary art.

2. Deep down, despite his public image as a dictator, the historical figure had a deep-rooted fear of losing power.

3. Deep down, the superhero lamented the fact that his powers couldn't solve all of life's problems.

4. Deep down, the antagonist in the movie was driven by a desire for revenge against the protagonist.