like a rock

stable steady

firm regular

agreed consecutive consentient continued set in stone unalloyed unanimous unbroken undivided uninterrupted united unmixed

broken divided incomplete incontinuous intermittent

rigidly securely solidly soundly strongly thoroughly tightly

hard

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

changeably flexibly indefinitely movably waveringly weakly