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I need one word (if there is any) for "seemingly small but very important".

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closed as not a real question by RegDwigнt Jun 10 '13 at 10:44

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

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Can you please give more information about the context in which you'd like to use this? –  simchona Jun 10 '13 at 8:31

2 Answers 2

A keystone is a single (usually small) element within a larger system which is required for that system to function correctly.

The central supporting element of a whole.

—Source: thefreedictionary.com

Although the term originated in architecture, it's used metaphorically in other fields. For example, a keystone species is a "species that has a disproportionately large effect on its environment relative to its abundance".

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I am working with a client company. Sometimes, in order to expedite some works I need to emphasize importance of subjects which are "Seemingly small but very important & crucial to resolve", for that purpose I would like to know what should I write the subject of my emails. –  Hasnain Quddus Jun 10 '13 at 12:07
    
@HasnainQuddus depending on the type of problem and the audience, I might use the word festering (seems like a minor nuisance, but could be much worse if left unresolved). You should probably include the this comment in your original question; it might just get reopened. –  p.s.w.g Jun 10 '13 at 12:21
    
I am working with a client company. Sometimes, in order to expedite some works I need to emphasize importance of subjects which are "Seemingly small but very important & crucial to resolve", for that purpose I would like to know what should I write the subject of my emails. I don't want to use "Seemingly small but important pending issue" but "....... pending issue". kindly help if there exist any word. –  Hasnain Quddus Jun 10 '13 at 12:29

Well, it's hyphenated, but does "innocent-looking" meet your needs? It's often used suggestively, & combined with a testimonial to that thing's importance/potency.

Non-adjectives:

There's "linchpin", suggestive of something small that holds everything else together.

Another sense, used often in engineering & in the military, is the idea of a "single-point failure", connoting an inappropriate level of operational significance placed on a fragile or non-redundant component.

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