sightliness n. 悦目,好看(来自sighly好看的)
insight n. 洞察力(in进入+sight→眼光看进去→洞察力)
insightful a. 有洞察力的
oversight n. 疏漏(over越过+sight→越过[漏洞]没看到;参考,overlook疏忽)