TDN.70:22 :ܩܫܝܫܐ ܒܟܠ݁ܙܒܢ ܠܘܬ ܩܫܝܘܬܐ ܕܗܝܡܢܘܬܐ ܠܐ ܡܫܬܚܠܦܢܐ ܢܗܘܐ‏ : an elder should always tend toward unchanging severity of faith
See the entire entry for qašyū, qašyūṯā n.f. hardness