(your) heart isn't in it

you do not feel something is exciting or interesting enough to do.

I tried to do some writing, but my heart wasn't in it.

Usage notes: sometimes used in the form your heart isn't in something:

His heart isn't in supervising people.

Related vocabulary: not have the stomach for something

• paint a bleak picture of something
• paint a [bleak/rosy etc.] picture of
• paint a [bleak/rosy etc.] picture of something
• paint a picture
• paint a ... picture of
• paint a picture of
• paint a ... picture of something
• paint a picture of something
• paint a rosy picture of
• paint a rosy picture of something
• paint into a corner
• paint someone into a corner
• paint someone with the same brush
• paint something with the same brush
• paint the town
• paint the town red
• paint with the same brush
• paint yourself into a corner
• pal around
• pal around with
• pal around with someone
• pale by comparison
• pale in comparison
• pale in comparison with
• pale in comparison with something