欠佳的英文：
suboptimal
subpar
not good enough

参考例句：

Best though it was, his suit smacked of cheap tailoring and bucolic unfashionable ness
他的衣服料子虽好，但做工欠佳，式样也土气。

He is in poor fig.
他健康欠佳

His falling health concerns me.
他的健康欠佳，使我担心。

She was in a bit of a mood this morning.
今天早晨她情绪欠佳。

Her performance didn't rate very high in the competition.
她在比赛中的表现欠佳。

His failing health concerns me.
他的健康欠佳，使我担心。

She complained of being out of sorts.
她抱怨说情绪欠佳。

She used her good looks to compensate for her lack of intelligence.
她智力欠佳权以美貌弥补

Poor health may be a barrier to success.
健康欠佳可能成为取得成功的障碍.

He was constrained by ill health to give up this appointment.
他因健康欠佳而被迫辞去此职。

suboptimal是什么意思：
adj. 未达最佳标准（品质）的，不是最理想的，不是最适宜的，不是最满意的
subpar是什么意思：
a. 在一般标准以下的,在平均水平以下的;在票面价值以下的
good是什么意思：
adj. 好的；令人满意的；愉快的；仁慈的
n. 好处；利益；有道德的人或事
adv. 好

A good appetite is a good sauce
饥不择食

The prompt goods have good qualities.
当场付款的物品质量不错。

Be not simply good; be good for something.
不要单纯做个好人，还要做个能派上用场的人。