resolute, determined
惈 centers on a firm, unwavering mindset: being resolute and determined, with a strong inner resolve.
惈 combines the heart radical 忄 (feelings, mind) with 果, which likely contributes the sound and may suggest a decisive outcome or result, fitting the idea of a determined mind.
The heart 忄 beside 果 (fruit/result) suggests a mind set on achieving a result: a resolute, determined heart that will not waver.
For カ, imagine a determined person shouting 'Ka!' as they make a firm decision: Ka -> カ, and their heart 忄 is set on the result 果.