Evidence, broadly construed, is anything presented in support of an assertion. This support may be strong or weak. The strongest type of evidence is that which provides direct proof of the truth of an assertion. At the other extreme is evidence that is merely consistent with an assertion but does not rule out other, contradictory assertions, as in circumstantial evidence.
A fair suspicion may be well worthy of further investigation, and it may well be worth the expense and trouble of examining witnesses to see whether it is well founded.
Jessel, M.R., In re Gold Co. (1879), L. R. 12 C. D. 84.