Entry 3 senses · 2 variants Webster, 1913 Causeless · Cause·less · IPA /ˈkɔːzləs/ a. adv. 01 a. 1. Self-originating; uncreated. 1. 1. Self-originating; uncreated. 2. Without just or sufficient reason; groundless. “My fears are causeless and ungrounded.” — Denham. 02 adv. Without cause or reason. 1. Without cause or reason.