P Ex9:7 :ܘܐܬ݁ܩܫܝ ܠܒܗ ܕܦܪܥܘܢ ܘܠܐ ܫܕܪܗ ܠܥܡܐ‏ : Pharaoh's heart was hardened and he did not release the people
See the entire entry for qšy vb. to be difficult