1. Uttered with unrestrained enthusiasm
   - burbly, effusive, gushing

1. Flow in an irregular current with a bubbling noise
   - ripple, babble, guggle, bubble, gurgle

See also: lively

Type of: go, sound

• unforthcoming
• unfortunate
• unfortunate person
• unfortunately
• unfounded
• unframed
• unfree
• unfreeze
• unfrequented
• unfretted
• unfriended
• unfriendliness
• unfriendly
• unfrightened
• unfrock
• unfrosted
• unfrozen
• unfruitful
• unfueled
• unfuelled
• unfulfillable
• unfulfilled
• unfunctional
• unfunded
• unfunny