徐々に （ジョジョニ） gradually, steadily, slowly, little by little, step by step, by degrees

徐行 （ジョコウ） going slowly (esp. to enable a vehicle to stop immediately), going at a reduced speed, slowing down, reducing speed

徐々 （ジョジョ） slow, gradual, steady, calm, composed, relaxed

緩徐 （カンジョ） gentle and quiet

徐に （おもむろに） suddenly, abruptly, slowly, without haste, calmly, gently, deliberately