A — 1: νοῦς
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(Strong's #3563 — Noun Masculine — nous — nooce )

for which see MIND , No. 1, is translated "understanding" in Luke 24:45 , AV (RV, "mind"); 1—Corinthians 14:14,15 (twice),19; Philippians 4:7; Revelation 13:18 .

A — 2: σύνεσις
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(Strong's #4907 — Noun Feminine — sunesis — soon'-es-is )

akin to suniemi, "to set together, to understand," denotes (a) "the understanding, the mind or intelligence," Mark 12:33; (b) "understanding, reflective thought," Luke 2:47; 1—Corinthians 1:19 , RV, "prudence;" Ephesians 3:4 , RV (AV, "knowledge"); Colossians 1:9; 2:2; 2—Timothy 2:7 . See PRUDENCE , No. 2.

A — 3: διάνοια
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(Strong's #1271 — Noun Feminine — dianoia — dee-an'-oy-ah )

for which see MIND , No. 2, is rendered "understanding" in Ephesians 4:18; 1—John 5:20 (in some texts, Ephesians 1:18 , AV, for kardia, "heart," RV).

B — 1: ἀσύνετος
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(Strong's #801 — Adjective — asunetos — as-oon'-ay-tos )

"without understanding or discernment" (a, negative, sunetos, "intelligent, understanding"), is translated without understanding" in Matthew 15:16 : Mark 7:18; Romans 1:31; 10:19 , RV, "void of understanding" (AV, "foolish"); in Romans 1:21 , RV, "senseless" (AV, "foolish").

1—Corinthians 14:20