unexpressed
/ˌʌnɪksˈprest/adjective
1- (of a thought or feeling) not communicated or made known（思想, 感情）未表达的; 未表露的：
he thought it best to leave his doubts unexpressed.
他认为最好是将疑问留在心里。
1.1
- Genetics (of a gene) not appearing in a phenotype【遗传】（基因）未表达的。