logy

The English suffix -ology or -logy denotes a field of study or academic discipline, and -ologist describes a person who studies that field. However not every field or study or discipline is an '-ology', for instance the study of childbirth is midwifery and a practitioner is a midwife.
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(a.)
Heavy or dull in respect to motion or thought; as, a logy horse.
  

A combining form denoting a discourse, treatise, doctrine, theory, science; as, theology, geology, biology, mineralogy.
  

Adjective
1. stunned or confused and slow to react (as from blows or drunkenness or exhaustion)
(synonym) dazed, foggy, groggy, stuporous
(similar) lethargic, unergetic