(adv.) With an even, level, or smooth surface; without roughness, elevations, or depression; uniformly; equally; comfortably; impartially; serenely.

ad eundem as as well at full length calmly ceteris paribus composedly conservatively coolly correspondingly deservedly disinterestedly dispassionately dully duly equably equally equitably equivalently fair fairly fifty-fifty flat flatly flatways flatwise flush horizontally identically impartially impersonally in a rut in balance in moderation in reason indifferently judiciously justifiably justifiedly justly lengthways lengthwise level like clockwork meetly moderately monotonously on a level on wheels properly proportionately prudently regularly restrainedly rightfully rightly routinely serenely smooth smoothly so soberly soothingly squarely steadily subduedly tediously temperately tranquilly uniformly unrelievedly upon even terms warrantably warrantedly within bounds within compass within reason without distinction