back·spin 
(băkspĭn′)
(băkspĭn′)n.
A spin that tends to retard, arrest, or reverse the linear motion of an object, especially of a ball.
- inconstancy
- inconstant
- inconstantly
- inconsumable
- inconsumably
- incontestability
- incontestable
- incontestably
- incontinence
- incontinency
- incontinent
- incontinently
- incontrollable
- incontrovertibility
- incontrovertible
- incontrovertibleness
- incontrovertibly
- inconvenience
- inconvenient
- inconveniently
- inconvertibility
- inconvertible
- inconvertibleness
- inconvertibly
- inconvincible