(adv.) In an direct manner; not in a straight line or course; not in express terms; obliquely; not by direct means; hence, unfairly; wrongly.

at an angle by proxy circlewise circuitously deceitfully deviately deviously digressively divagationally divergently excursively fraudulently furtively guilefully in behalf of insidiously obliquely on one side round about shiftily sideling sidelong sideways sidewise surreptitiously to one side treacherously trickily underhandedly