形容词: completely副词
比较级more complete,最高级:most complete
例句: 
The man was mad, completely mad. 这个人疯了, 完全疯了。 
It is not completely right. 这不完全对。 
一,双音节词和多音节词在前面加 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 认真地 →more carefully |→most carefully
二、不规则形式
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、比较等级
英语中形容词副词有三个比较等级,即原级、比较级和最高级
completely比较级和最高级是什么
Completely,属于有形容词加ly构成的副词,这种情况不管副词的音节有多少,一律在单词前面加上more和most变为比较级和最高级