| Word | Definitions | Synonyms |
|---|---|---|
| infallible | (adjective) incapable of failure or error | - |
| infamous | (adjective) known widely and usually unfavorably | Synonyms: ill-famed, notorious |
| infantile | (adjective) of or relating to infants or infancy | - |
| (adjective) indicating a lack of maturity | Synonyms: childish | |
| (adjective) being or befitting or characteristic of an infant | - | |
| infatuated | (adjective) marked by foolish or unreasoning fondness | Synonyms: enamored, in love, potty, smitten, soft on, taken with |