形容詞: completely副詞
比較級more complete,最高級:most complete
例句: 
The man was mad, completely mad. 這個人瘋了, 完全瘋了。 
It is not completely right. 這不完全對。 
一,雙音節詞和多音節詞在前面加 more 或 most,表示更(最)...,或者加 less 或 least ,表示更(最)不...
interesting 有趣的 →more interesting → most interesting
important 重要的 →less important → least important
carefully 認真地 →more carefully |→most carefully
二、不規則形式
good/well | better | best
bad/ill/badly | worse | worst
many/much | more | most
little | less | least
far | farther/further | farthest/furthest
old | older/elder | oldest/eldest
三、比較等級
英語中形容詞副詞有三個比較等級,即原級、比較級和最高級
Completely,屬於有形容詞加ly構成的副詞,這種情況不管副詞的音節有多少,一律在單詞前面加上more和most變為比較級和最高級