1. not having a deck or decks
Usage: nautical
2. not decorated or adorned

Examples

• The small undecked boat bobbed in the harbor.
• They sailed in an undecked canoe across the lake.
• The undecked vessel was unsuitable for rough seas.
• Her undecked Christmas tree looked bare in the corner.
• The walls remained undecked for the simple ceremony.
• The undecked halls echoed with their footsteps.