Did you mean inefficient?
More Suggestions:
- infinity
- inconcinnity
- invenit
- intervarsity
- indefinite
- insufficient
- indehiscent
- inefficiency
- intervenient
- infinite
- insanity
- indecent
- anthracite
- in the wind
- interfacing
- interjacent
- invaginate
- on the inside
- in the offing
- in the dust
- on the scene
- on-the-scene
- in the round
- in the least
- in the face
- in the event of
- on the face of it