1. a person who engages in an activity or subject in a superficial or casual way, without serious commitment or deep knowledge
Usage: often used with a slightly negative connotation to suggest lack of expertise or dedication
2. a duck or other waterfowl that feeds by dabbling, tipping forward to eat plants and insects from shallow water
Usage: ornithological term

Examples

• He's just a dabbler in photography; he hasn't invested in serious equipment yet.
• She tried painting, music, and writing, but remained a dabbler in all of them.
• The mallard is a common dabbler found in ponds and shallow lakes.
• Unlike professional chefs, home cooks are often dabblers experimenting with new recipes.
• Dabblers in philosophy may read popular books but rarely study the subject deeply.
• The dabbler spent a few weeks learning guitar before moving on to something else.