IPA: /mɜːrˈsɛnəˌrɪnəs/
KK: /mɜrˈsɛnəˌriːnɪs/
The condition of being motivated by personal gain, especially in terms of money, rather than by loyalty or ethics.
His mercenariness was evident in his willingness to switch sides for a higher paycheck.
Mercenariness is formed from "mercenarius" (from Latin, meaning hired or wage-earning) and the suffix "-ness" (meaning the state or quality of). The word refers to the state of being a mercenary or the quality of being motivated by money rather than loyalty.
Think of 'mercenarius' which relates to being hired for pay, and remember that 'mercenariness' describes the quality of being motivated by money.