Lexical Definition

‎θρησκός‎ thrēskós (thrace'-kos) religious ^G:A
probably from the base of ‎θροέω‎

religious.

• ceremonious in worship (as demonstrative), i.e. pious

Abbott-Smith

* θρῆσκος (-κός, WH), -ου, ὁ
religious, careful of the outward forms of divine service (see previous word): Ja 1:26.†
SYN.: εὐσεβής, θεοσεβής, δεισιδαίμων (v. Tr., Syn., § xlviii).

Abbott-Smith References

Liddell-Scott-Jones

θρησκός-ος, ον,

religious, [NT]; in bad sense, superstitious, [Refs 5th c.AD+] has also θρεσκός.)

_{LSJ Scripture Refs: Jas.1.26}