This is the 8361st most frequent Japanese word.
心底
"Heartfelt" or "from the bottom of one's heart."
Here, '心底' expresses a deep and true feeling originating from one's heart.
私は心底からあなたを信頼しています。
I trust you from the bottom of my heart.
Here, '心底' signifies an intense emotive reaction to something experienced.
この景色を見て心底感動した。
I was deeply moved by this view.
In this case, '心底' refers to the innermost feelings or thoughts a person holds.