1. With resolute determination
   "we firmly believed it"
   - firm, steadfastly, unwaveringly 
2. In a secure manner; in a manner free from danger
   - securely 
3. With firmness
   - hard

See also: firm

• slatternly
• slaty
• slaty-gray
• slaty-grey
• slaughter
• slaughterer
• slaughterhouse
• slaughterous
• Slav
• slave
• slave ant
• slave dealer
• slave driver
• slave labor
• slave labour
• slave market
• slave owner
• slave ship
• slave state
• slave trade
• slave trader
• slave traffic
• slave-maker
• slave-making ant
• slaveholder