1. Not characterized by a fixed principle or rate; at irregular intervals
   - irregularity

Type of: quality

• fact-finding
• facticity
• faction
• factional
• factionalism
• factious
• factiously
• factitious
• factitive
• factoid
• factor
• factor analyse
• factor analysis
• factor analytic
• factor analytical
• factor analyze
• factor I
• factor II
• factor III
• factor in
• factor IV
• factor IX
• factor of proportionality
• factor of safety
• factor out