noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   An indifferent or unenthusiastic attitude. uncountable
2. 2
   The belief that climate change is due to human activity but that it is not a serious problem. uncountable

Etymology

From lukewarm + -ism.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.