insubordinate, stubborn, wrong
忤 centers on defiant resistance: being insubordinate, stubbornly opposing authority, or going against what is expected or correct.
忤 combines the heart radical 忄 with 午, which likely contributes the sound and may suggest opposition or crossing. The exact historical development is uncertain.
The heart 忄 beside 午 (noon) suggests a heart that stubbornly stands against the midday sun, refusing to bend or obey.
For ゴ, imagine a stubborn person who always says 'Go away!' when told what to do: Go -> ゴ, and their defiant heart resists every command.