Correct

心底

/ xīndǐ /
Strokes

Definition

bottom of one's heart

Example

As a Noun

bottom of one's heart; heart of hearts; back of one's mind

1
men
她们
de
gǎn
感激
shì
发自
xīn
心底
de
  

Their gratitude came from the heart.

2
ài
  
,
zhè
shì
发自
xīn
心底
de
  

I love you. I mean it from the bottom of my heart.

3
Xīn
心底
yǒu
zhǒng
guài
奇怪
de
gǎnjué
感觉

have a strange feeling at the back of one's mind

4
Shēn
mái
xīn
心底

be buried deep in one's heart

As a Noun

intention; heart