Before inz: erím • Before all other morphemes: erim
Used as an intensifier after adjectival roots; -uit/-oip is used to strengthen meaning. Examples include joalerimi (very good), benerimi (very well), foarterimu (very strongly), and súfliferimi (very windy). As stated by the aforementioned Wikipedia article:
The absolute superlative, derived from the Latin synthetic superlative in -issimus, is formed by adding -issimo to an adjective: intelligente ("intelligent"), intelligentissimo ("very intelligent"); sporco ("dirty"), sporchissimo ("very dirty"). If the two letters before the last vowel are pr or br (e.g., aspro, celebre), the r is removed and -errimo is the suffix used (asperrimo, celeberrimo) ("very sour", "very famous").
From the Wiktionary usage notes on its Latin ancestor, -issimus:
For the adjective meaning "exact", see aibem.