securely

hard tight

firm

deeply firmly solidly soundly steadfastly tightly

loosely unfixedly

rigidly 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

actively energetically firmly fully greatly heartily heavily resolutely robustly solidly staunchly steadily vigorously

completely decidedly forcibly indomitably invincibly mightily stoutly sturdily