Reverse Dictionary: SOFT-HEADED

ADJECTIVES
1715 — HAGGIS-HEADED soft-headed, foolish, stupid → Sc.
1851 — BALMY soft, idiotic, weak-minded; insane → sl.
..20C — DATY soft-headed; sun-struck → military sl.
1900 — DAFFY imbecile, soft → Eng. dial. (Bk.)

NOUNS, PERSON
1682 — CABBAGE-HEAD a brainless fellow; a stupid person; a soft-headed or witless person; a blockhead, dolt, oaf, fool, or simpleton; a thickhead; a silly person → sl. 
1682 — LIGHTS a fool; a soft-head; an oaf → Brit. colloq.
1855 — NAFFY a soft-headed person; a simpleton; a blockhead; an idiot → Eng. dial. (Bk.)
1886 — HAGGIS a term of contempt applied to a lumpish, unwieldy person; a soft, ‘pudding-headed’ person → Sc. & N. Eng. dial.
1890 — PASH-HEAD a simpleton, an idiot; a soft-headed person → Eng. dial. 
1903 — BALMY a soft, weak-minded person → sl.
1945 — SPOOPS a soft-brained fellow → US Western sl. (Bk.)
1945 — SPOOSY a soft-brained fellow → US Western sl. (Bk.)