Horizontally(adv.) In a horizontal direction or position; on a level; as, moving horizontally.
Thesaurus Entries
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