awkward socially uncomfortable; unsure and constrained in manner; "awkward and reserved at parties"; "ill at ease among eddies of people he didn't know"; "was always uneasy with strangers"
graceless -
lacking graciousness; "a totally graceless hostess"
ungracious lacking charm and good taste; "an ungracious industrial city"; "this curt summary is not meant to be ungracious"; "ungracious behavior"
graceless -
lacking social polish; "too gauche to leave the room when the conversation became intimate"; "their excellent manners always made me feel gauche"