Secretively is how a secretive person acts: they do the thing in a hidden, close way, so other people will not easily see what they are up to.

Secretivelysecretively is how a secretive person acts是secretive的人做事的方式 — they do the thing in a hidden, close way他們用隱密、封閉的方式做事 so other people will not easily see what they are up to讓別人不容易看出他們在做什麼

You glance secretively at a message; you slip a letter into a bag secretively; a company might move money secretively.

You glance secretively at a message你secretively地瞄一眼訊息；you slip a letter into a bag secretively你secretively地把信塞進包包；a company might move money secretively公司也可能secretively地把錢轉走

The adverb points at the manner, not at the person as a whole. Someone who is not a secretive person in daily life can still do one act secretively — for fun, from shyness, or because the news is not ready.

The adverb這個副詞 points at the manner指的是做事的方式 not at the person as a whole不是指整個人的個性。Someone who is not a secretive person in daily life一個平常不算神祕的人 can still do one act secretively還是可以某一件事做得secretively — for fun, from shyness, or because the news is not ready可能是好玩、害羞，或因為消息還沒能公開

It often suggests a little theatre: lowered voice, turned shoulder, a look to see who is watching. In writing it can sound slightly old or story-like; in speech people often say secretly or on the quiet instead.

It這個字 often suggests a little theatre常常帶點戲劇感 — lowered voice, turned shoulder, a look to see who is watching壓低聲音、轉過肩膀、瞄一眼看誰在看。In writing在書寫裡 it can sound slightly old or story-like聽起來有點舊、有點故事感 in speech在口語裡 people often say secretly or on the quiet instead人比較常說secretly或on the quiet

Secretly is the broader, everyday adverb. Secretively keeps the flavour of that guarded, holding-back habit.

Secretlysecretly is the broader, everyday adverb是比較廣、比較日常的副詞。Secretivelysecretively keeps the flavour of that guarded, holding-back habit保留了那種提防、有所保留的味道