uneruptive
/juːnɪˈrʌptɪv/Definitions
1. adjective
not erupting or not erupting easily; not rising or bursting forth violently
“The geologist studied the volcano’s uneruptive behavior over the past few years.”
2. noun
an eruption that does not occur or occurs easily; a lack of eruption
“The geologist attributed the volcano’s uneruptive status to the lack of magma pressure.”