firm, solid, steady, regular, permanent
This is a strong cord.
Aber Katrin hat schöne, feste Brüste, und so lassen wir sie.
But Katrin has lovely, firm breasts, and we’ll leave her as she is.
— Never Look Away (2018)
Ich hatte nie eine feste Arbeit.
I never had a permanent job.
He has firm principles.
Wie viele feste Freundinnen hattet ihr schon?
How many steady girlfriends have you had?
Meine feste Freundin ist Kanadierin.
My girlfriend is Canadian.