| infrahuman | (adjective) belonging to a group below humans in evolutionary development | - |
|---|
| inframaxillary | (adjective) relating to the lower jaw | Synonyms: mandibular |
|---|
| infrangible | (adjective) not capable of being violated or infringed | Synonyms: absolute, inviolable |
|---|
| (adjective) difficult or impossible to break or separate into parts | - |
| infrared | (adjective) having or employing wavelengths longer than light but shorter than radio waves; lying outside the visible spectrum at its red end | - |
|---|
| infrasonic | (adjective) having frequencies below those of audible sound | - |
|---|
| infrequent | (adjective) not frequent; not occurring regularly or at short intervals | - |
|---|