acrasia UK /əˈkɹeɪ.zɪ.ə/US /əˈkɹeɪ.zi.ə/ noun1 •(no longer used, rare) Lack of self-control; excess, intemperance; also, irregular or unruly behaviour.Him fortuned (hard fortune ye may ghesse) / To come, vvhere vile Acrasia does vvonne [live], / Acrasia a false enchaunteresse, / That many errant knightes hath fovvle fordonne: […] — 1590 formsacrasias