| Clue | Length | Answer |
|---|---|---|
| unsustained | 4 letters | vain |
| unsustained | 4 letters | weak |
| unsustained | 7 letters | unfixed |
| unsustained | 7 letters | unsound |
| unsustained | 7 letters | untried |
| unsustained | 8 letters | untested |
| unsustained | 8 letters | unproved |
| unsustained | 9 letters | unsettled |
| unsustained | 9 letters | unfounded |
| unsustained | 9 letters | untenable |
| unsustained | 9 letters | spasmodic |
| unsustained | 10 letters | ungrounded |
| unsustained | 10 letters | unverified |
| unsustained | 11 letters | unsupported |
| unsustained | 11 letters | unconfirmed |
| unsustained | 11 letters | unwarranted |
| unsustained | 11 letters | uncertified |
| unsustained | 12 letters | undetermined |
| unsustained | 13 letters | unestablished |
| unsustained | 13 letters | unsubstantial |
| unsustained | 13 letters | unsustainable |
| unsustained | 13 letters | unsupportable |
| unsustained | 14 letters | uncorroborated |
| unsustained | 14 letters | undemonstrated |
| unsustained | 15 letters | unauthenticated |
| unsustained | 15 letters | unsubstantiated |
| unsustained | 18 letters | without-foundation |
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