IshGen 75:1 :ܟܡܝܘܬܗ݀ ܕܝܢ ܘܡܢܝܘܬܗ݀ ܕܬܝܒܘܬܗܘܢ ܠܢ ܠܐ ܓܠܝܐ‏ : the amount and the nature of their repentance is not obvious to us
See the entire entry for mānāyū, mānāyūṯā n.f. inherent nature, quiddity