FUGITIVE :

Option B, enduring, is incorrect because a fugitive is not necessarily enduring anything. They may be fleeing from something, but they are not necessarily enduring it.

Option C, vain, is incorrect because a fugitive is not necessarily vain. They may be fleeing from something, but they are not necessarily doing so because they are vain.

Option D, weak, is incorrect because a fugitive is not necessarily weak. They may be fleeing from something, but they are not necessarily doing so because they are weak.

In conclusion, the correct answer to the question “FUGITIVE : A. Escaping B. Enduring C. Vain D. Weak” is A. Escaping.