common, ordinary, plain, familiar, popular, vulgar mean generally met with and not in any way special, strange, or unusual.

common implies usual everyday quality or frequency of occurrence

and may additionally suggest inferiority or coarseness.

ordinary stresses conformance in quality or kind with the regular order of things.

plain is likely to suggest homely simplicity.

familiar stresses the fact of being generally known and easily recognized.

popular applies to what is accepted by or prevalent among people in general sometimes in contrast to upper classes or special groups.

vulgar, otherwise similar to popular, is likely to carry derogatory connotations (as of inferiority or coarseness).

evident, manifest, patent, distinct, obvious, apparent, plain, clear mean readily perceived or apprehended.

evident implies presence of visible signs that lead one to a definite conclusion.

manifest implies an external display so evident that little or no inference is required.

patent applies to a cause, effect, or significant feature that is clear and unmistakable once attention has been directed to it.

distinct implies such sharpness of outline or definition that no unusual effort to see or hear or comprehend is required.

obvious implies such ease in discovering that it often suggests conspicuousness or little need for perspicacity in the observer.

apparent is very close to evident except that it may imply more conscious exercise of inference.

plain suggests lack of intricacy, complexity, or elaboration.

clear implies an absence of anything that confuses the mind or obscures the pattern.

frank, candid, open, plain mean showing willingness to tell what one feels or thinks.

frank stresses lack of shyness or secretiveness or of evasiveness from considerations of tact or expedience.

candid suggests expression marked by sincerity and honesty especially in offering unwelcome criticism or opinion.

open implies frankness but suggests more indiscretion than frank and less earnestness than candid.

plain suggests outspokenness and freedom from affectation or subtlety in expression.