/ ˈstɔːlwət; NAmE -wərt/ noun , adjective
■ noun
stalwart (of sth) a loyal supporter who does a lot of work for an organization, especially a political party
■ adjective [ usually before noun ]
1.
loyal and able to be relied on, even in a difficult situation
SYN faithful :
stalwart supporters
2.
( formal ) physically strong
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WORD ORIGIN
late Middle English : Scots variant of obsolete stalworth , from Old English stǣl place + weorth worth .