unsmiling

a.不笑的，严肃的

unscripted, unscrupulous, unscrupulously, unscrupulousness, unseat, unseemliness, unseemly, unseen, unselfish, unserviceable, unsettle, unsettled, unsettling, unshakable, unshakeable, unsightliness, unsightly, unsinkable, unskilled, unskillful, unsociable, unsocial, unsold, unsolicited, unsolved, unsophisticated, unsound, unsparing, unsparingly, unspeakable, unspeakably, unspoiled, unspoken, unspotted, unstable, unsteadily, unsteadiness, unsteady, unstinting, unstintingly,