What is another word for "forgetful"?

Roget's Thesaurus (1911) lists these synonyms for "forgetful": able, amnesia, amnesty, and, attention, away, back, behind, being, bygone, cast, cause, clean, come, consign, decay, deliberate, die, discharge, ear, efface, escape, fade, fail, failing, failure, fall, fault, forget, forgetfulness, forgive, forgotten, from, general, gone, have, head, heedless, insensibility, insensible.