earnest
ear-nest
noun
A serious and sincere state of mind or intention, often in the phrase 'in earnest'.
"The preparations began in earnest after lunch."
adjective
Showing serious and sincere conviction, intention, or feeling.
"She made an earnest plea for help."
Thesaurus
Synonyms: dear, devout, heartfelt, sincere, serious, solemn, purposeful, businesslike