adj ·Common ·High school level

Definitions

Adjective

1. 1
   Showing no interest, vigor, determination, or enthusiasm.

   "the lackadaisical look on his face"

2. 2
   Lazy; slothful; indolent.

Adjective

1. 1
   idle or indolent especially in a dreamy way wordnet
2. 2
   lacking spirit or liveliness wordnet

Synonyms

All synonyms

idlelanguidlanguorouslistlessunenthusiasticuninterested

Antonyms

All antonyms

enthusiasticheartlessinterested

Example

More examples

"His lackadaisical attitude to studying explains his poor grades."

Etymology

From the archaic expression lackadaisy + -ic + -al.

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