“The flabby, pretending, weak-eyed devil of a rapacious and pitiless folly” is one of the central images with which Marlow characterizes the behavior of the colonists. He refers back to this image at a number of key points later in the story. It is thus a very important clue as to what Marlow actually thinks is wrong about imperialism—Marlow’s attitudes are usually implied rather than directly stated. Marlow distinguishes this devil from violence, greed, and desire, suggesting that the fundamental evil of imperialism is not that it perpetrates violence against native peoples, nor that it is motivated by greed. The flabby, weak-eyed devil seems to be distinguished above all by being shortsighted and foolish, unaware of what it is doing and ineffective.
The hand of the “flabby devil” is apparent in the travesties of administration and the widespread decay in the Company’s stations. The colonials in the coastal station spend all their time blasting a cliff for no apparent reason, machinery lies broken all around, and supplies are poorly apportioned, resting in abundance where they are not needed and never sent to where they are needed. Given the level of waste and inefficiency, this kind of colonial activity clearly has something other than economic activity at stake, but just what that something might be is not apparent. Marlow’s comments on the “flabby devil” produce a very ambivalent criticism of colonialism. Would Marlow approve of the violent exploitation and extortion of the Africans if it was done in a more clear-sighted and effective manner? This question is difficult to answer definitively.