Shihāb al-Dīn al-Suhrawardī (d. 587/1191) famously criticised the central concepts of Avicennian metaphysics as merely mind-dependent (or iʿtibārī) notions. This paper aims to show that despite his critique, Suhrawardī held that these concepts are meaningful, indeed necessary for human cognition. By the same token, it is argued that their re-emergence in Suhrawardī’s ishrāqī metaphysics is not a matter of incoherence. Although the paper’s findings can be generalised to hold of all iʿtibārī concepts, mutatis mutandis, our focus is on the concept of substance, mainly because of the importance of the concept of ‘dusky substance’ in ishrāqī metaphysics.