FORGETFUL
forgetful, oblivious
(adjective) failing to keep in mind; “forgetful of her responsibilities”; “oblivious old age”
unmindful, forgetful, mindless
(adjective) not mindful or attentive; “while thus unmindful of his steps he stumbled”- G.B.Shaw
unretentive, forgetful, short
(adjective) (of memory) deficient in retentiveness or range; “a short memory”
Source: WordNet® 3.1
Etymology
Adjective
forgetful (comparative more forgetful, superlative most forgetful)
Unable to remember things well; liable to forget.
(math) Dropping some of the input's structure or properties before producing an output.
Source: Wiktionary
For*get"ful, a.
1. Apt to forget; easily losing remembrance; as, a forgetful man
should use helps to strengthen his memory.
2. Heedless; careless; neglectful; inattentive.
Be not forgetful to entertain strangers. Heb. xiii. 2.
3. Causing to forget; inducing oblivion; oblivious. [Archaic or
Poetic] "The forgetful wine." J. Webster.
Source: Webster’s Unabridged Dictionary 1913 Edition