1. Based primarily on surmise rather than adequate evidence
   - conjectural, divinatory, hypothetical, supposed, suppositional, suppositious, supposititious

See also: theoretic, theoretical

• intercontinental ballistic missile
• interconvertible
• intercostal
• intercostal artery
• intercostal muscle
• intercostal vein
• intercourse
• intercrop
• intercross
• intercrossed
• intercrural
• intercurrent
• interdenominational
• interdental
• interdepartmental
• interdepartmental support
• interdepend
• interdependence
• interdependency
• interdependent
• interdict
• interdiction
• interdiction fire
• interdigitate
• interdisciplinary