all of a sudden Antonyms

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