a person who makes mistakes because of incompetence

अकलमंद व्यक्ति जो गलतियाँ करता है

English Usage: He was such a bungler that he even messed up the simplest tasks.

Hindi Usage: वह इतना अकलमंद था कि उसने सबसे सरल काम भी बिगाड़ दिया।