Which term describes someone who shows a susceptibility to bribery?

The term that describes someone who shows a susceptibility to bribery is "venal." This word specifically refers to a willingness to be corrupted or to engage in dishonest practices for personal gain, often through accepting bribes. In contexts like law enforcement or public service, a venal individual is one who can be easily influenced by money or favors, compromising their ethical standards.

In contrast, the other terms do not relate to susceptibility to bribery. "Fearless" describes a lack of fear or bravery, which does not pertain to ethical integrity. "Torpor" refers to a state of physical or mental inactivity, not related to corruption or bribery. "Tyro" denotes a beginner or someone who is inexperienced, which also does not imply any willingness towards unethical behavior. The specificity of "venal" in referring to moral or ethical corruption through bribery makes it the most accurate choice for this question.