1. Firmly.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• storly,
• stayl,
• stanly,
• sutably,
• sutibly,
• stabb,
• stalll,
• sterly,
• ustable,
• stabil,
• sotable,
• statly,
• stabley,
• suable,
• stanely,
• stealy,
• tablw,
• sutable,
• styable,
• stabl

• stabilize,
• Stauble,
• steeply,
• suitably,
• stableboy,
• stable,
• stableman,
• stabile,
• stabling,
• stabilise,
• stability,
• stubbled,
• stubble,
• stubbly,
• Stabler,
• stiffly,
• Stablein.

The adjective form of the word "stably" is "stable".

The plural form of the word "stably" is "stablies".

The singular form of the word "stably" is "stable"