1
vastly + adjective
The two approaches are vastly different.
这两种方法大为不同。
非常，极大地
先理解核心含义，再看它在真实句子里的用法。
非常，极大地
to a very great extent or degree
The two approaches are vastly different.
这两种方法大为不同。
极大地,以广阔的方式
Greatly, in a vast manner.
The new software has vastly improved our productivity.
新软件极大地提高了我们的生产力。
The two plans are vastly different in cost.
这两个计划在成本上相差巨大。
The company's profits have vastly increased this year.
公司今年的利润大幅增长。
The two approaches are vastly different.
这两种方法大为不同。
“vastly improved”常用于描述改进程度。
The software has been vastly improved.
该软件已得到极大改进。
用于比较级前加强程度。
This method is vastly more efficient.
这种方法高效得多。
Not this
He made a vastly mistake.
Use this
He made a vast mistake.
vastly 是副词，不能直接修饰名词；应使用形容词 vast。
Not this
This method is vastly more better.
Use this
This method is vastly better.
vastly 本身已表示程度，比较级 better 前面不能再加 more。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
非常不同
Their opinions are vastly different.
他们的观点非常不同。
大大改善
The new system is vastly improved.
新系统大大改善了。
优越得多
This model is vastly superior to the old one.
这个型号比旧的好得多。
极为重要
This issue is vastly important for our future.
这个问题对我们的未来极为重要。
远远超过
The costs vastly exceeded our estimates.
成本远远超过了我们的估计。
Use vastly naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
记‘vast（广大的）+ ly’，变成副词‘极大地’。想象无边大海（vast ocean）让人‘vastly’震撼。
语域：formal 常见场景：comparisons、descriptions of scale or degree 通常用于正式或书面语境，强调程度极大，多与比较或描述巨大差异、改进等搭配。
ghastly and lastly rhyme with vastly (same /stli/ sound with /ɑː/ vowel). Mostly, costly, beastly, ghostly have the same '-stly' spelling but different vowel sounds: /oʊ/, /ɒ/, /iː/, /oʊ/ respectively. Pay attention to vowel differences.
Dictionary facts from ECDICT, WIKTIONARY.