not secure; beset with difficulties
inclined to shake as from weakness or defect
vibrating slightly and irregularly; as e.g. with fear or cold or like the leaves of an aspen in a breeze
having or feeling no doubt or uncertainty; confident and assured
certain to occur; destined or inevitable
impossible to doubt or dispute
exercising or taking care great enough to bring assurance
reliable in operation or effect
(of persons) worthy of trust or confidence
definitely or positively (`sure' is sometimes used informally for `surely')
certain not to fail
infallible or unfailing
physically secure or dependable
