Usage Note
Sospecha nearly always carries a negative connotation — one suspects wrongdoing, not good luck. The related verb is sospechar ('to suspect') and the adjective sospechoso means 'suspicious' or 'suspect' as a noun. The phrase bajo sospecha means 'under suspicion'. Unlike English 'suspicion', sospecha does not have a neutral curiosity sense.
Examples
"La policía tenía sospechas sobre el vecino."
Natural Translation
The police had suspicions about the neighbour.

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