1. In a believable manner
   "he acted believably sincere" 
2. Easy to believe on the basis of available evidence
   - credibly, plausibly, probably, tenably

See also: believable

Antonym: unbelievably

• Stephanus Johannes Paulus Kruger
• stephead
• Stephen
• Stephen A. Douglas
• Stephen Arnold Douglas
• Stephen Butler Leacock
• Stephen Collins Foster
• Stephen Crane
• Stephen Decatur
• Stephen Foster
• Stephen Girard
• Stephen Grover Cleveland
• Stephen Harper
• Stephen Hawking
• Stephen Jay Gould
• Stephen Leacock
• Stephen Michael Reich
• Stephen Samuel Wise
• Stephen Sondheim
• Stephen Spender
• Stephen Vincent Benet
• Stephen William Hawking
• Stephenson
• stepladder
• stepmother