Dreye權威釋義|retarded

a.

retard

vt.

使減速；妨礙；阻止
The heavy rain retarded our progress.
大雨妨礙了我們的進展。
推遲，延遲
Her death was retarded by five years because of good treatment.
由於良好的治療，她多活了五年。
【機】使（點火）延遲

vi.

同義參見:

以上來源於：《英漢大辭典》

adj.

less advanced in mental, physical, or social development than is usual for one's age.

以上來源於：《簡明牛津英語詞典》