without any yeast or other raising agent
‘They were eating unleavened bread.’;
(nautical) A large, hard biscuit made from unleavened flour and water; formerly used as a long-term staple food aboard ships.
Not leavened; containing no leaven; as, unleavened bread.
Hardtack (or hard tack) is a simple type of dense biscuit or cracker made from flour, water, and sometimes salt. Hardtack is inexpensive and long-lasting.
made without leavening;
‘unleavened bread is often simply flour mixed with water’;