Chinese words with 固 character meaning (HSK)

GU4, DING4
fixed, set, regular

GEN1, SHEN1, DI4, GU4
deep-rooted (problem etc)

GONG3, GU4
to consolidate, consolidation, to strengthen

GU4, RAN2
admittedly (it's true that...)

GU4, TI3
solid

GU4, YOU3
intrinsic to sth, inherent, native

GU4, ZHI5
persistent, stubborn

JIAN1, GU4
firm, firmly, hard, stable

LAO2, GU4
firm, secure

NING2, GU4
to freeze, to solidify, to congeal, fig. with rapt attention

WAN2, GU4
stubborn, obstinate