not able, conditioned, or constructed to withstand the effect of something, as a disease, a specific change in temperature, or harsh treatment; susceptible to damage or ill effects.

not resistant; passively obedient.

a person who does not resist force.

a person who maintains that violence or established authority, even when tyrannical, should not be resisted by force.

adjective

acquiescent , resigned , submissive , meek , passive , tolerant , yielding