stick-in-the-mud

nouns

someone who moves slowly
"in England they call a slowpoke a slowcoach"
plodder, slowcoach, slowpoke, stick-in-the-mud

adjectives

(used pejoratively) out of fashion; old fashioned
"moss-grown ideas about family life"
fogyish, moss-grown, mossy, stick-in-the-mud, stodgy