plumb Synonyms

plumb bob plummet plumb line perpendicular plum clean thoroughly totally straightly straight standing true take soundings squarely square spang sound smack sinker sheerly upright upward utterly up and down unswervingly set square plumb rule on end straight up slap bang in line caliper quantify even as precisely stand up vertically verticality vertical sheer right gauge fitt fathom explore exactly even erect entirely endways