IPA: /ˈsniːkɪnəs/
KK: /ˈsniːkɪnəs/
The quality of being secretive or deceptive, often in a way that is not honest or straightforward.
His sneakiness made it hard for anyone to trust him.
Sneakiness is formed from "sneak" (of uncertain origin, possibly from Middle Dutch "snecken", meaning to creep or move stealthily) and the suffix "-iness" (meaning the quality of being). The word describes the quality of being sneaky or stealthy.
Think of the word 'sneak' which suggests moving quietly or stealthily, and remember that 'sneakiness' refers to the quality of being stealthy.