Unlockable / unscrewable?/ unstringable?

Question

It is said unlockable(0) is structurally ambiguous: not + lockable or able to be unlocked.

My source says unscrewable(1), unstringable(2) and unrollable(3) are the likes of unlockable.

I don't understant that because I can't find words stringable(or unstringable), screwable and unrollable etc, in dictionary when I can find lockable and unlockable.

Do you think #1,2 and 3 are the same case as #0?

AlpheccaStars · Accepted Answer

People might make up words that make sense in a particular context, following some pattern, but they are not words that would make the dictionary, or ever be used again.

Unlock - a verb, meaning to change the state of a lock. It is the opposite of lock.

Unlockable - something that cannot be locked.

string is not a common verb except in phrasal expressions "to string up" or "to string along."

You can string beads, so someone might say "Don't buy these beads; they don't have holes in them - they are not stingable." It's the only context I could think of where someone might make up the word stringable.

roll: unroll is the opposite of roll up, not roll. Rollable is a word (something that is on wheels and rolls). Unrollable is not. We would say: This bed is not rollable.

The last one is equally implausable, but, I suppose there might be a very socially inappropriate context for the adjective form.

Unlockable / unscrewable?/ unstringable?

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