A neutral 3rd lies exactly between a minor 3rd and a major 3rd. They say that major chords sound happy and minor chords sound sad, so neutral chords (also known as Swiss chords) must sound vague and neutral am I right? They must sound a bit comme ci comme ca, a bit grey?
To me this is utter nonsense. Whatever neutral chords sound like, they ain’t neutral, they’re actually punchy as hell. There is often a quality of tension, but sometimes not. Depending on what comes before it, you can easily mistake a neutral chord for a minor or major.
If major is happy,
And minor is sad,
Neutral is angry,
Suspicious,
Disappointed,
Gritty,
Peppery,
Quizzical,
Cute,
Crunchy,
Alerting,
And many such things (take your pick).
Just, whatever you do, don’t say that neutral sounds neutral.