IPA: /ˌɪn.kəˈmɛn.sjʊ.rət/
KK: /ɪnˈkɑːmənˌsʊrɪt/
Not able to be compared in terms of size, amount, or degree; not proportionate or adequate.
The punishment was incommensurate with the crime committed.
Incommensurate → It is formed from "in-" (meaning not), "commensurabilis" (from Latin, meaning measurable together), and the suffix "-ate" (indicating a state or condition). The word describes a state of being not measurable together or incompatible in terms of comparison.
Think of 'not' ('in-') being able to be 'measured together' ('commensurabilis') — that's why incommensurate means things that cannot be compared or measured together.