Example: "There is no clear division between a liquid and a solid. The soggy soil we are standing on is a case in point. So is the yogurt you're having."

What's an idiom, phrase, or word for "no clear division"?

I thought of "fine line", but it doesn't seem to be appropriate in this case; a "fine line" is usually used in a cautionary way, with the second object being unfavorable in some way - for example, "There is a fine line between being funny and being immature."

  • "A thin line" maybe? If there's a thin line between things, it's hard to distinguish them. Mar 15, 2016 at 6:10
  • 1
    Gray, fuzzy line.
    – Hot Licks
    Mar 15, 2016 at 12:49
  • ("Fine line" or "thin line" can imply distinct, just difficult to discern without careful examination.)
    – Hot Licks
    Mar 15, 2016 at 12:50
  • 1
    Aside. There are some scientific names for these "transition" zones. You can look them up. I found one on wiki - "mesophase". (Which I would never use in prose.)
    – user116032
    Mar 15, 2016 at 16:36

4 Answers 4


Probably indistinct may suit your context:

Not clearly or sharply delineated: an indistinct pattern; indistinct shapes in the gloom.

From the Free Dictionary

  • An indistinct mass of liquid and solid.

One idiomatic expression for this is much of a muchness

(idiomatic) Of two or more things, having little difference of any significance between them.



Try continuum.

Continuum noun A continuous sequence in which adjacent elements are not perceptibly different from each other, but the extremes are quite distinct: a continuum of special educational needs - ODO

Here's an example from MW:

His motives for volunteering lie somewhere on the continuum between charitable and self-serving.

In your example, you could say, "Liquids and solids are part of a continuum." or following the form of your example more directly, "There is a continuum between a liquid and a solid."


You can perhaps say blur, as in blurring the lines

to make the ​difference between two things less ​clear, or to make it ​difficult to ​see the ​exact ​truth about something

This ​film blurs the ​line/​distinction/​boundary between ​reality and ​fantasy.

[Cambridge Online]


The soggy soil that we are standing on blurs the line between liquid and solid. So does the Yogurt you are having!

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