• sneakey,
• speadily,
• sneekly,
• snarkily,
• sneakly,
• sneekily,
• sneakie,
• speakly,
• sneakin,
• scrakily,
• snakily,
• snakfly,
• snakly,
• aneakily,
• zneakily,
• xneakily,
• dneakily,
• eneakily,
• speakible,
• snikily

• snake oil.

The adjective form of the word "sneakily" is "sneaky".

The plural form of the word "sneakily" is "sneakily." The word does not change when pluralized.

The singular form of the word "sneakily" is "sneaky"