open

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.

liable, open, exposed, subject, prone, susceptible, sensitive mean being by nature or through circumstances likely to experience something adverse.

liable implies a possibility or probability of incurring something because of position, nature, or particular situation.

open stresses a lack of barriers preventing incurrence.

exposed suggests lack of protection or powers of resistance against something actually present or threatening.

subject implies an openness for any reason to something that must be suffered or undergone.

prone stresses natural tendency or propensity to incur something.

susceptible implies conditions existing in one's nature or individual constitution that make incurrence probable.

sensitive implies a readiness to respond to or be influenced by forces or stimuli.