IshGen 206:18 :ܡܬܢܫܝܢܘܬܐ܂ ܐܢܫܝܢܝ ܠܡ ܐܠܗܐ ܥܡܠܝ ܕܒܥܒܕܘܬܐ ܘܒܒܝܬ ܐܣܝܪ̈ܐ‏ : forgetfulness: that is that God made me forget my labor in servitude and prison
See the entire entry for meṯnašyānū, meṯnašyānūṯā n.f. forgetfulness