overly

Compared meaning: more than is needed or proper (adverb).

比较义项：过度、超过应有的程度（副词）。

• too

  The everyday, highly common word for excess; typically followed by 'to' + verb or 'for' + phrase naming the negative result, and natural in both speech and writing.

  表示过度最常用的口语词；后面常接“to+动词”或“for+短语”说明造成的负面结果，口语和书面语都很自然。

  This coffee is too hot to drink right now.

  这杯咖啡现在太烫了，没法喝。

• overly 本词

  More formal and bookish; directly modifies an adjective or participle without needing a following infinitive, and often carries a mildly critical, evaluative tone.

  更正式、更书面化；可以直接修饰形容词或分词，不必接不定式，常带有轻微批评、评价的语气。

  The teacher said the essay was overly long for such a simple topic.

  老师说这篇作文对于这么简单的主题来说写得过长了。

Too and overly both mean more than is needed. Too is the everyday, common word, usually followed by to plus a verb, or for plus a phrase. Overly is more formal and bookish; it modifies an adjective or participle directly and often sounds critical.

too 和 overly 都表示程度超过应有或合适的限度，但 too 是最常用的口语词，overly 更正式、更书面，语气也略带评价色彩；两者在语法搭配上也不同。