形容詞 avid:

1. (often followed by `for') ardently or excessively desirous
   同義詞：devouring, esurient, greedy
2. marked by active interest and enthusiasm
   同義詞：great, eager, zealous

1. An avid stamp collector, John rides the subject pretty hard whenever it is introduced.
   約翰是個熱心的郵票收藏家，只要有人提起集郵，他就會滔滔不絕。

av.id

adj.（形容詞）
Having an ardent desire or unbounded craving; greedy:
渴求的：有著熱切的渴望或無限的要求的；貪婪的：
例句：
avid for adventure.
渴求冒險

Marked by keen interest and enthusiasm:
殷切的：以強烈的興趣和熱情為特征的：
例句：
an avid sports fan.See Synonyms at eager
殷切的體育愛好者參見 eager

來源：
Latin avidus
拉丁語 avidus
from avôre [to desire]
源自 avôre [渴望]

【引伸】
av.idly
adv.（副詞）