Plonk
Definition 1 of 2

Contextual Use
Understand that 'plonk' can imply carelessness; it's often used to indicate an action done without much thought.

He plonked down his backpack, showing he was tired.
Casual Tone
When using 'plonk' to describe dropping something, it's often informal, so use it in casual conversations.

Don't plonk that on the floor!
Sound Association
The word conveys a specific noise, which can help build imagery in writing.

The papers plonked to the ground, scattering everywhere.
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