to throw or set down clumsily or casuallyplopped his backpack down on a chair
plopped his backpack down on a chair
flopped, flumped, planked, plumped, plunked(or plonked)
flung, heaved(or hove), slung, tossedensconced, installed, planted, settled
英语同义词词典收录了63618条英语词条，基本涵盖了全部常用同义词或反义词的辨析及翻译，是英语学习的有利工具。