Each item in this section consists of a sentence with an underlined word followed by four options. Select the option that is opposite in meaning to the underlined word. He wrote an _incisive_ article on corruption in politics.

The word 'incisive' is an adjective derived from the Latin 'incisivus', meaning 'to cut with a sharp edge'. In a figurative sense, it describes communication or thinking that is remarkably clear, direct, sharp, and acute. Synonyms for incisive include 'penetrating', 'trenchant', and 'precise', as they all denote a quality of being sharply perceptive or effective in cutting through complexity. Conversely, the antonym of 'incisive' must represent a lack of clarity or sharpness. 'Vague' is explicitly identified as an antonym for 'trenchant' and 'incisive', as it implies something that is not clearly expressed, defined, or grasped. Therefore, while options 2, 3, and 4 are synonyms that reinforce the meaning of being sharp and direct, 'vague' is the opposite in meaning.