all of a sudden Antonyms

at a regular pace perceptibly progressively stepwise little by little step by step bit by bit languidly again and again chronically uniformly all in good time by degrees gradatim unspectacularly uninterruptedly unhurriedly unhurried slowly but surely piece by piece sequentially one after the other on a regular basis inch by inch twofold twice expectedly evenly doubly double continuously constantly consistently consecutively circumspectly cautiously gently gingerly gradually systematically successively steadily slowly regularly piecemeal moderately lazily inchmeal haltingly casually