1. (adj)defenseless, defenceless lacking protection or support "a defenseless child"
2. (adj)naked, defenseless having no protecting or concealingcover "naked to mine enemies"- Shakespeare
3. (adj)defenseless, defenceless lacking weapons for self-defense
4. (adverb)defenseless, defenceless, defenselessly, defencelessly without defense "the child was standing in the middle of the crossfire, defenselessly"