do-gooder

[ doo-goo d-er, -goo d- ]
/ ˈduˈgʊd ər, -ˌgʊd- /

noun

a well-intentioned but naive and often ineffectual social or political reformer.

Origin of do-gooder

1925–30, Americanism; do good + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for do-gooder

do-gooder

noun

informal, usually derogatory a well-intentioned person, esp a naive or impractical one

Derived forms of do-gooder

do-goodery, noundo-gooding, noun, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012