stick in the mud
/ˈstɪk.ɪn.ðəˌmʌd/noun
Graduate
1
A person unwilling to participate in activities; a curmudgeon or party pooper.
2
More generally, one who is slow, old-fashioned, or unprogressive; an old fogey.
Thesaurus
#derogatory
A person unwilling to participate in activities; a curmudgeon or party pooper.
More generally, one who is slow, old-fashioned, or unprogressive; an old fogey.