Lexical Definition

‎ἁπλοῦς‎ haploûs (hap-looce') sound ^G:A
probably from ‎Α‎ (as a particle of union) and the base of ‎πλέκω‎

single.

• properly, folded together, i.e. single (figuratively, clear)

Abbott-Smith

ἁπλοῦς, -ῆ, -οῦν (contr. fr. -όος; < ἁ.- cop., πλόος), [in LXX: Pr 11:25*;]
simple, single: in a moral sense (DCG, ii, 628 f.), ἀφθαλμός, Mt 6:22, Lk 11:34. (In π. of a marriage dowry, v. MM, s.v.).†
SYN.: ἄδολος, ἄκακος, ἀκέραιος (Tr., Syn., § lvi; Cremer, 107, 639).

Abbott-Smith References

Liddell-Scott-Jones

Included with: ἁπλοῦς, η, ον,

contraction ἁπλοῦς, ῆ, οῦν, opposed to διπλόος twofold, and so,

__I single, ἁπλῆ γὰρ οἶμος εἰς Ἁιδου φέρει[Refs 5th c.BC+]; ἁπλῷ τείχει περιτειχίζειν[Refs 5th c.BC+]
__I.b ἁπλαῖ (i.e. κρηπῖδες), αἱ, single-soled shoes, [Refs 5th c.BC+]
__II simple, plain, straightforward, κελεύθοις ἁπλόαις ζωᾶς[Refs 5th c.BC+]; ὡς ἁ. λόγῳ[Refs 5th c.BC+]; ἁ. λόγος the matter is simple, [Refs 5th c.BC+]; ἁ. διήγησις simple narrative (without dialogue), [Refs 5th c.BC+]; οὐκ ἐς ἁπλοῦν φέρει leads to no simple issue, [Refs 5th c.BC+]; of single-membered periods, [Refs 4th c.BC+]; of habits, ἁπλούστατος βίος[Refs 4th c.BC+]a plain course, [Refs 4th c.BC+]
__II.b of persons, or their words, thoughts, and acts, simple, open, frank, ἁπλᾶ γάρ ἐστι τῆς ἀληθείας ἔπη[Refs 5th c.BC+]; opposed to δόλος, [Refs 5th c.BC+]
__II.c simple-minded, ὁ κριτὴς ὑπόκειται εἶναι ἁ.[Refs 4th c.BC+]; in bad sense, simple, silly, [Refs 5th c.BC+]
__III simple, opposed to compound or mixed, [Refs 5th c.BC+]; opposed to μεμιγμένος, κεκραμένος, [Refs 4th c.BC+]; ἁ. ὀνόματα, opposed to διπλᾶ, [Refs]; also of nouns, without the article, [Refs 2nd c.AD+]; of the positive adjective, [Refs 1st c.AD+]
__III.b ἁ. βιβλία rolls containing a single author, [Refs]
__III.c of precious metals, unalloyed, pure, [Refs 4th c.AD+]
__III.d ἁ. ἐπίδεσμος, a kind of bandage, [Refs 5th c.BC+]
__III.2 absolute, sheer, ἀκρασία[Refs 5th c.BC+]
__III.3 simple, unqualified [Refs 5th c.BC+]
__III.4 general, opposed to ἀκριβής, [Refs 4th c.BC+]
__IV adverb ἁπλῶς, see entry vocative
__V comparative and superlative ἁπλούστερος, ἁπλούστατος, see above; irregular superlative ἁπλότατος[Refs 1st c.BC+]. (Cf. δι-πλόο; ἁ- = sṃ; -πλόος perhaps identical with πλοῦς 'voyage', cf. Serb. jedan put '(one journey, hence) once'; transition from 'once' to 'simple' as in Lett. vienkars?\~Xs 'simple' (cf. Lithuanian vienkart 'once').)