IPA: /ˈɜrnəstnəs/
KK: /ˈɜrnɪstnəs/
The quality of being serious and sincere in one's intentions or actions.
Her earnestness in pursuing her goals inspired everyone around her.
Earnestness → It is formed from "earnest" (from Old English *eornost*, meaning serious or grave) and the suffix "-ness" (meaning the state or quality of). The word "earnestness" refers to the quality of being serious or sincere in intention.
Think of the Old English word for serious ('earnest') and remember that 'earnestness' means the quality of being serious or sincere.