hættulegum
Hættulegum is the dative plural form of the Icelandic adjective hættulegur, which means dangerous or hazardous. In Icelandic, adjectives decline to agree with the gender, number and case of the nouns they modify; in the dative plural, many adjectives take the ending -um. Therefore, hættulegum is used when describing plural nouns in the dative case.
Examples of usage include phrases such as í hættulegum aðstæðum (in dangerous circumstances) and á hættulegum
Etymology: hættulegur is built from hætta, meaning danger, with the common suffix -legur that forms adjectives
Notes: When the noun is singular or occurs in other cases, other forms of the adjective are