1. making a short, hollow sound like that of a plucked string or object striking something
Usage: informal; onomatopoetic
2. lacking courage or determination; timid or weak
Usage: informal; chiefly British

Examples

• The plunky sound of the guitar string echoed through the room.
• He gave a plunky response when asked to defend his position.
• The old banjo made a distinctly plunky noise when she strummed it.
• Her plunky attitude meant she rarely stood up for herself.
• The plunky twang of the ukulele filled the small café.