— callow
— fledgling
— incapacitate
— inception
— incipience
— incipient
— inexpedient
— inexpensive
— inexpensively
— inexperience
— inexpert
— inexplicable
— inexpressible
— insipid
— inspect
— inspection
— inspire
— inspired
— inspiring
— inspirit
— insufficiency
— insuperable
— naif
— naive
— new
— raw
— unfledged
— uninitiate
— uninitiated
— unpracticed
— unpractised
— unseasoned
— unskilled
— untested
— untried
— unversed
— young