most restrained

discreet laid-back mild muted reasonable reticent subdued tasteful unobtrusive

chilled controlled cool moderate plain retiring shrinking steady withdrawn

bottled up calm and collected conservative corked up in charge in check inobtrusive on a leash self-controlled soft temperate unaffable undemonstrative under control under wraps unexcessive unexpansive unextreme uptight

communicative

extroverted friendly outgoing

assured bold confident