The song is in standard tuning

Chords:

G:  320033
Em9:   022033
D/F#:  20023x
D:     xx0232
Cadd9: x32033

Intro:

D--5-5-5-5-5-5-5-5-5-5-5-5-4-4-4-4 (8x)

Chorus:

Em9    Cadd9   G                 
It's undeniable 
D/F#
how brilliant you are
Em9    Cadd9           G
In an unreliable world 
D/F#
you shine like the stars
Em9    Cadd9            G                  D/F#
It's unforgetable now that we've come this far
Em9    Cadd9            G             D/F#
It's unmistakable that you are undeniable

Verse:

Sam as the chorus but palm muted