syn·cli·nal 
(sĭn-klīnəl)
(sĭn-klīnəl)adj.
1. Sloping downward from opposite directions to meet in a common point or line.
2. Geology Relating to, formed by, or forming a syncline.
- inexpressive
- inexpressively
- inexpugnability
- inexpugnable
- inexpugnably
- inextensible
- in extenso
- inextinguishable
- inextinguishably
- inextirpable
- in extremis
- inextricability
- inextricable
- inextricableness
- inextricably
- INF
- inf.
- in faith
- infallibility
- infallible
- infallibleness
- infallibly
- infamous
- infamously
- infamousness