firmly

rigidly securely solidly soundly strongly thoroughly tightly

hard

durably enduringly fast fixedly inflexibly like a rock motionlessly solid stably steadily stiffly substantially tight unflinchingly unshakeably

changeably flexibly indefinitely movably waveringly weakly

adamantly decisively doggedly persistently resolutely staunchly steadfastly strictly stubbornly tenaciously

unwaveringly

constantly indefatigably intently obdurately obstinately perseveringly pertinaciously purposefully stolidly through thick and thin unchangeably with heavy hand

changeably flexibly indefinitely movably waveringly weakly