Thiamine deficiency is a medical condition caused by a lack of vitamin B1 in the body. The symptoms of thiamine deficiency include weakness, fatigue, memory loss, and muscle pain. However, antonyms for thiamine deficiency would be words that indicate the opposite, such as "adequate thiamine levels," "sufficient vitamin B1," or "healthy thiamine intake." These words describe a person who has enough thiamine in their body, and therefore aren't experiencing the symptoms of deficiency. To avoid thiamine deficiency, it is recommended to consume a balanced diet with foods that are high in vitamin B1, such as whole grains, nuts, and beef.