immeritorious /ɪmɛɹɪˈtɔːɹɪəs/ adjective1 •Unworthy of merit; not deserving of merit; not meritorious.As long as the defence is credible and can be reasonably substantiated so that the counterclaim is not evidently immeritorious, the attacked party has little to lose, and may gain time. — 2004 formsmore immeritorious · most immeritorious