Mildly

Adverb

 * 1) In a mild manner.
 * 2) To a mild degree; slightly.
 * a mildly amusing joke

Thesaurus
after a fashion, appreciably, at any rate, at best, at least, at most, at the least, at the most, at the outside, at worst, comparatively, detectably, fairly, gently, in a manner, in a way, in part, in some measure, incompletely, leastwise, like a lamb, meekly, merely, moderately, modestly, not comprehensively, not exhaustively, only, pacifically, part, partially, partly, peaceably, pro tanto, purely, quietly, relatively, simply, so far, somewhat, tamely, thus far, to a degree, to some degree, tolerably, visibly

Derived terms

 * to put it mildly