We found one dictionary that defines the word rigless:

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1. rigless: Wiktionary

Definitions from Wiktionary (rigless) ▸ adjective:  (oil industry) Without a rig. ▸ Words similar to rigless ▸ Usage examples for rigless ▸ Idioms related to rigless ▸ Wikipedia articles (New!) ▸ Popular nouns described by rigless ▸ Words that often appear near rigless ▸ Rhymes of rigless ▸ Invented words related to rigless