1) Assailable 2) At risk 3) Compromising 4) Conquerable 5) Dangerous 6) Defenceless 7) Defenseless 8) Disposed 9) Easily influenced 10) Endangered 11) Gullible 12) Having a propensity 13) Having a tendency 14) Inclined 15) Insecure 16) Liable 17) Open 18) Penetrable 19) Pliable 20) Predisposed 21) Prone 1) Assailable 2) At risk 3) Conquerable 4) Dangerous 5) Defenceless 6) Defenseless 7) Endangered 8) Exposed 9) Powerless 10) Receptive 11) Susceptible 12) Threatened 13) Undefendable 14) Undefended 15) Unguarded 16) Unprotected 17) Unsafe 18) Weak 19) Young 
See susceptible
• (a.) Liable to injury; subject to be affected injuriously; assailable; as, a vulnerable reputation. • (a.) Capable of being wounded; susceptible of wounds or external injuries; as, a vulnerable body.
[Adjective] A person is vulnerable when they are weak and unprotected.
Capable of being hurt or damaged.
Capable of being hurt or damaged.
Vul'ner·a·ble adjective [ Latin vulnerabilis wounding, injurious, from vulnerare to wound, vulnus a wound; akin to Sanskrit vra...a : confer French vulnérable .] 1. Capable of being wounded; susceptible of wounds or external injuries; as, a vulnerable
[adj] - susceptible to attack 2. [adj] - susceptible to criticism or persuasion or temptation 3. [adj] - capable of being wounded or hurt
adjective capable of being wounded or hurt; `vulnerable parts of the body`
[SAT terms] capable of being wounded or hurt capable of being wounded or hurt[Lexical terms] capable of being wounded or hurt