Lexical Definition

‎μωραίνω‎ mōraínō (mo-rah'-ee-no) be foolish G:V
from ‎μωρός‎

become fool, make foolish, lose savour.

Usage: 6 forms in 8 verses
Form Translated As     In Verse(s)
ἐμώρανεν has made foolish 1Cor.1.20
ἐμωράνθησαν they became fools Rom.1.22
μωρανθῇ shall become tasteless Matt.5.13Luke.14.34
μωρανθήσεται will be moronish LXX.Isa.19.11
μωραίνων being moronish LXX.Isa.44.25
εμωράνθη has acted moronish LXX.Jer.51.17
was made moronish LXX.Jer.10.14

Abbott-Smith

μωραίνω (< μωρός), [in LXX: Is 19:11, Je 10:14 28 (51):17* (בּער ni.), II Ki 24:10, Is 44:25 R (סכל ni., pi.)*;]
1. cl., to be foolish, play the fool.
2. LXX and NT, causal, to make foolish: I Co 1:20; pass., to become foolish: Ro 1:22; of salt that has lost its flavour, become tasteless: Mt 5:13, Lk 14:34.†

Abbott-Smith References

Book Refs
2 Samuel 24:10
Isaiah 19:11 · 44:25
Jeremiah 10:14 · 51:17*
Matthew 5:13
Luke 14:34
Romans 1:22
1 Corinthians 1:20

Liddell-Scott-Jones

μωραίνω-αίνω,

future - ᾰνῶ [Refs 5th c.BC+]: aorist ἐμώρᾱνα [Refs 4th c.BC+] —passive, see below [Refs]: (μῶρος):—to be silly, foolish, drivel, [Refs 5th c.BC+]; play the fool, [Refs 4th c.BC+] make a mad attempt, [Refs 4th c.BC+]; οὐδεὶς.. ταῦτα μωραίνωαίνει indulges in these follies, [Refs 5th c.BC+]: euphemistic of illicit love, γυναῖκα μωραίνωαίνουσαν [Refs]

__II causal, make foolish, convict of folly, βουλὴ αὐτῶν μωραίνωανθήσεται [LXX]; μωραίνωάνθην σφόδρα[LXX+NT]:—passive, to become foolish, be stupefied, [αἶγες] ἑστᾶσιν ὥσπερ μεμωραίνωαμμέναι [μωραίνωόομαι)">Refs 4th c.BC+]; to become insipid, ἐὰν τὸ ἅλας μωραίνωανθῇ [NT]

LSJ Scripture Refs: LXX.Isa.19.11LXX.2Kgs.24.101Cor.1.20Matt.5.13