1. Stupid.

2. A stupid person.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• mullard,
• dollards,
• dillards,
• dillar,
• declard,
• dallar,
• dollare,
• dulerd,
• hollard,
• hillard,
• duellar,
• dupllard,
• dulard,
• dulllard,
• dellard,
• dullird,
• dullerd,
• dulled,
• ullary,
• dulcamra

• dulled,
• dillard,
• dollard,
• Duller,
• dollar.

The adjective form of the word "dullard" is "dull" or "dull-headed".

The plural of the "dullard" can be the "dullards".

The singular of the "dullard" can be the "dullard".