earnest

/ˈɜrnɪst/
adjective
  1. Showing sincere and serious intention or effort.
    • The volunteers worked with earnest dedication to clean up the park.
    • His earnest apology convinced everyone that he truly regretted his mistake.
    • She made an earnest attempt to learn the piano, practicing every day.
noun
  1. A token or pledge of something to come; a down payment or deposit.
    • They paid $1,000 as an earnest on the house to hold it until the loan was approved.
    • He gave her a ring as an earnest of his promise to return.
    • The handshake was an earnest of their agreement to work together.
What does "earnest" mean? | whatsthatwordmean | whatsthatwordmean