WordWeb Online

1. (often followed by 'of' or 'to') yielding readily to or capable of
   "susceptible to colds"; "susceptible of proof"
    
2. Easily impressed emotionally

See also: allergic, amenable, capable, convincible, fictile, hypersensitised [Brit], hypersensitive, hypersensitized, impressible, impressionable, liable, nonimmune, nonresistant, open, persuadable, persuasible, pliable, predisposed, sensitised [Brit], sensitive, sensitized, suasible, subject, suggestible, supersensitised, supersensitive, supersensitized, susceptibility, susceptibleness, temptable, tractable, unprotected, unresistant, unvaccinated, vulnerable, waxy

Antonym: unsusceptible

Encyclopedia: Susceptible