1. In an overbearingly domineering manner; as a dictator
   - dictatorially, autocratically, bossily 
2. In an authoritative and magisterial manner
   - authoritatively

See also: magisterial

• inexactitude
• inexactly
• inexactness
• inexcusable
• inexcusably
• inexhaustible
• inexhaustibly
• inexistence
• inexistent
• inexorability
• inexorable
• inexorableness
• inexorably
• inexpedience
• inexpediency
• inexpedient
• inexpediently
• inexpensive
• inexpensively
• inexpensiveness
• inexperience
• inexperienced
• inexperienced person
• inexperient
• inexpert