-esfəl adjective
1. : resulting or terminating in success : having the desired effect
a successful experiment
2. : gaining or having gained success ; especially : having attained wealth, position, or fame
a successful writer
a successful banker
3. of a plant or animal group : represented by diverse forms and occupying a wide variety of ecological niches
• suc·cess·ful·ly -fəlē, -li adverb
• suc·cess·ful·ness noun -es