heart not in it

(one's) heart isn't in it

One is not emotionally invested in something. I used to love running, but my heart just isn't in it anymore—that's why I quit the track team this year. I can tell by the way you wrote this that your heart wasn't in it. Is something distracting you?
See also: heart
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

heart not in it

see under heart in it.
See also: heart, not
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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