Persevering and constant in effort or application; assiduous. See synonyms at busy.
ETYMOLOGY:
From Latin sdulus, from sdul, zealously : s, without; see s(w)e- in Appendix I + dol, ablative of dolus, trickery (probably from Greek dolos, cunning; see del-2 in Appendix I).
s
j
-l
dulus, from s
, zealously : s
u·lous·ness, se·du
-d
