ad libitum /ad libˈi-təm or -tŭm/

1. At will, at pleasure
2. Extempore, impromptu (abbrev ad lib.)

ad-lib /ad-libˈ/ adverb

Spontaneously or freely

Impromptu, extemporized

To extemporize or speak without preparation, esp to fill up time

1. An improvised speech
2. A spontaneous (often humorous) remark

• unbalanced
• unbalanced translocation
• unbalances
• unbalancing
• unballasted
• unbanded
• unbanked
• unbaptised
• unbaptize
• unbaptized
• unbaptizes
• unbaptizing
• unbar
• unbarbed
• unbarbered
• unbare
• unbared
• unbares
• unbaring
• unbark
• unbarked
• unbarking
• unbarks
• unbarred
• unbarricade