by installments

constantly continuously deliberately gently increasingly moderately progressively regularly steadily

bit by bit by degrees imperceptibly in small doses inch by inch little by little perceptibly piece by piece piecemeal sequentially serially step by step successively unhurriedly

abruptly fastly intermittently suddenly

moderately partly somewhat

by degrees fractionally halfway in part in some measure little by little not wholly piece by piece piecemeal to a certain degree to a certain extent

completely totally wholly