| Word | Definitions | Synonyms |
|---|---|---|
| insubstantially | (adverb) not substantially; lacking substantial expression or fullness | Synonyms: impalpably |
| insufferably | (adverb) in an extremely arrogant or conceited manner | - |
| (adverb) to an insufferable degree | Synonyms: unsufferably | |
| insufficiently | (adverb) to an insufficient degree | - |
| insultingly | (adverb) in an unfair and insulting manner | Synonyms: foully |
| (adverb) in a disrespectful and insulting manner | - | |
| insuperably | (adverb) to an insuperable degree | - |