(adj): vs. infallible) -- (likely to fail or make errors
(adj): vs. reliable), undependable (vs. dependable) -- (not worthy of reliance or trust
(adj): likely to perform unpredictably
(adj): not consistent or dependable
(adj): of e.g. advice
(adj): dangerously unstable and unpredictable
(adj): vs. safe), unsafe -- (involving or causing danger or risk; liable to hurt or harm
(adj): lacking a sense of responsibility
(adj): vs. responsible) -- (showing lack of care for consequences
