《Painless》的詞曲作者和演唱者是前One Direction成員Louis Tomlinson，歌詞內容如下：
Verse 1:
Broken heart, feel the pain
Trying hard to make it go away
Chasing dreams, got my feet on the ground
But I can't seem to get you out of my head
Chorus:
I'm feeling so (x3)
Painless, it's a lie
I'm feeling so (x3)
Without you by my side
Verse 2:
Tears in eyes, can't believe
You're not here to dry them every time
Going through, every single memory
But I can't seem to find the way to let you go
Chorus:
I'm feeling so (x3)
Painless, it's a lie
I'm feeling so (x3)
Without you by my side
Bridge:
Every moment I'm missing you most of all
It's killing me, I'm trying to get over you
But it feels like my heart's taken hostage by my mind
Trying to break free from this emotion that won't fade
Chorus: (repeat)
Outro:
My heart feels (x6) now that you're gone
You took everything, left me hollow and empty inside (empty inside)
And I feel (x6) with every breath that I take
I want you back, but I know it's over now (over now)
My heart feels (x4) now that you're gone.
這首歌是一首抒情的情歌，主要描述失去心愛的人的痛苦和無助。歌詞中充斥著痛苦、悲傷和思念，讓人感受到作者失去愛情後的無力和失落。歌詞中反覆出現的“Painless”一詞，也是對於愛情無奈的嘲諷和諷刺。歌曲結尾的副歌部分再次強調了這種無力和失落，以及對回憶的痛苦思念。