If you tell someone that it is advisable to do something, you are suggesting that they should do it, because it is sensible or is likely to achieve the result they want. Because of the popularity of the region, it is advisable to book hotels or camp sites in advance = wise + advisability ad·vis·abil·ity I have doubts about the advisability of surgery in this case. inadvisability. something that is advisable should be done in order to avoid problems or risks inadvisable