(a.) Still as a stock, or fixed post; perfectly still.

adamant adamantine as is as per usual as things are as usual at a halt at a loss at a nonplus at a stand at an impasse at anchor baffled bewildered dead-still firm fixed frozen idle immobile immotile immotive immovable inactive inflexible irremovable motionless moveless mystified nonplussed out of commission pat perplexed quiescent riding at anchor rigid sedentary standpat static stationary statuelike still stock-still stuck stumped unactive unemployed unmovable unmoved unmoving unyielding