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Both your examples that do not have hyphens are words with negative prefixes. Words that include a negative (or positive) prefix will usually be written without a hyphen.

Examples: antimatter, indecisive, unwilling, probiotic, and nonaggression.

If the word includes an adjective that is neither directly negative or positive but is instead otherwise descriptive, then you should include a hyphen.

Examples: strong-armed, evil-minded, ill-adviced, and well-intended.

"well" is a borderline case, but it is not 100% positive. It's between neutral and positive, not one of those words you would use as a prefix in the same sense that you use pro, un, in or anti.

I hope this makes sense.

EDIT: Upon reading the above answer I now realize there are further prefixes that are neither positive or negative but still should not include a hyphen. I don't think it would be productive for me to quote the full list but words like extraordinary, infrastructure and transatlantic certainly seem to prove my theory a bit flawed. The point remains, however, that there are certain prefixes that are usually used without hyphen.

Both your examples that do not have hyphens are words with negative prefixes. Words that include a negative (or positive) prefix will usually be written without a hyphen.

Examples: antimatter, indecisive, unwilling, probiotic, and nonaggression.

If the word includes an adjective that is neither directly negative or positive but is instead otherwise descriptive, then you should include a hyphen.

Examples: strong-armed, evil-minded, ill-adviced, and well-intended.

"well" is a borderline case, but it is not 100% positive. It's between neutral and positive, not one of those words you would use as a prefix in the same sense that you use pro, un, in or anti.

I hope this makes sense.

There are further prefixes that are neither positive or negative but still should not include a hyphen. I don't think it would be productive for me to quote the full list but words like extraordinary, infrastructure and transatlantic certainly seem to prove my theory a bit flawed. The point remains, however, that there are certain prefixes that are usually used without hyphen.

Both your examples that do not have hyphens are words with negative prefixes. Words that include a negative (or positive) prefix will usually be written without a hyphen.

Examples: antimatter, indecisive, unwilling, probiotic, nonaggression.

If the word includes adjective that is neither directly negative or positive but is instead otherwise descriptive, then you should include a hyphen.

examples: strong-armed, evil-minded, ill-adviced, well-intended.

"well" is a borderline case but it is not 100% positive. It´s between neutral and positive, not one of those words you would use as a prefix in the same sense that you use pro, un, in or anti.

I hope this makes sense.

EDIT: Upon reading the above answer I now realize there are further prefixes that are neither positive or negative but still should not include a hyphen. I don´t think it would be productive for me to quote the full list but words like extraordinary, infrastructure and transatlantic certainly seem to prove my theory a bit flawed. The point remains, however, that there are certain prefixes that are usually used without hyphen.

Both your examples that do not have hyphens are words with negative prefixes. Words that include a negative (or positive) prefix will usually be written without a hyphen.

Examples: antimatter, indecisive, unwilling, probiotic, and nonaggression.

If the word includes an adjective that is neither directly negative or positive but is instead otherwise descriptive, then you should include a hyphen.

Examples: strong-armed, evil-minded, ill-adviced, and well-intended.

"well" is a borderline case, but it is not 100% positive. It's between neutral and positive, not one of those words you would use as a prefix in the same sense that you use pro, un, in or anti.

I hope this makes sense.

EDIT: Upon reading the above answer I now realize there are further prefixes that are neither positive or negative but still should not include a hyphen. I don't think it would be productive for me to quote the full list but words like extraordinary, infrastructure and transatlantic certainly seem to prove my theory a bit flawed. The point remains, however, that there are certain prefixes that are usually used without hyphen.

Both your examples that do not have hyphens are words with negative prefixes. Words that include a negative (or positive) prefix will usually be written without a hyphen.

Examples: antimatter, indecisive, unwilling, probiotic, nonaggression.

If the word includes adjective that is neither directly negative or positive but is instead otherwise descriptive, then you should include a hyphen.

examples: strong-armed, evil-minded, ill-adviced, well-intended.

"well" is a borderline case but it is not 100% positive. It´s between neutral and positive, not one of those words you would use as a prefix in the same sense that you use pro, un, in or anti.

I hope this makes sense.

Both your examples that do not have hyphens are words with negative prefixes. Words that include a negative (or positive) prefix will usually be written without a hyphen.

Examples: antimatter, indecisive, unwilling, probiotic, nonaggression.

If the word includes adjective that is neither directly negative or positive but is instead otherwise descriptive, then you should include a hyphen.

examples: strong-armed, evil-minded, ill-adviced, well-intended.

"well" is a borderline case but it is not 100% positive. It´s between neutral and positive, not one of those words you would use as a prefix in the same sense that you use pro, un, in or anti.

I hope this makes sense.

EDIT: Upon reading the above answer I now realize there are further prefixes that are neither positive or negative but still should not include a hyphen. I don´t think it would be productive for me to quote the full list but words like extraordinary, infrastructure and transatlantic certainly seem to prove my theory a bit flawed. The point remains, however, that there are certain prefixes that are usually used without hyphen.