Antonym: remindful. Similar words: fretful, forgive and forget, forget, gorge, tactful, hurtful, forgery, doubtful. Meaning: [fə(r)'getfʊl] 
adj. 1. (of memory) deficient in retentiveness or range 2. not mindful or attentive 3. failing to keep in mind.
adj. 1. (of memory) deficient in retentiveness or range 2. not mindful or attentive 3. failing to keep in mind. 
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(1) I've been forgetful these days.
(2) I've been forgetful lately.
(3) Old people are sometimes forgetful.
(4) He was soon forgetful of all dangers.
(5) He became very forgetful in his declining years.
(6) My old uncle has become rather forgetful.
(7) She has become very forgetful in recent years.
(8) I'm getting forgetful in my old age.
(9) She can be very forgetful.
(10) She's getting very forgetful in her old age.
(11) My mother has become very forgetful and confused recently.
(12) Grandfather is forgetful and often repeats himself when he tells a story.
(13) My grandfather is getting more forgetful.
(14) Age is foolish and forgetful when it underestimates youth. J. K. Rowling 
(15) She was easily distracted and forgetful at school.
(16) Absence makes the heart grow fonder... or forgetful. James Matthew Barrie
(17) Ellen was about as disorganized and forgetful as any fourth grade child in memory.
(18) They can also be forgetful or very tired and perhaps bad tempered.
(19) I was elated by the two peaks(Sentencedict.com ), but forgetful of how long the walk out would be.
(20) No wonder she was easily distracted and forgetful at school.
(21) She's a little forgetful(sentencedict.com), but that comes with old age.
(22) Once, in a forgetful moment, he moved his hands sensuously down her stomach.
(23) Indeed I was forgetful, pathologically so, and for this too I felt nothing but remorse.
(24) Every actor ought to know his lines backwards before he goes on stage, as nervousness may make him forgetful.
(25) As she got older, she became more prickly and forgetful.
(26) His father began to lose his memory bit by bit, becoming increasingly forgetful.
(27) She's in her eighties now and apt to be a bit forgetful.
(28) Also he appeared to have corrupted her: she was alternately prickly and forgetful.
(29) Others include a complete therapeutic list at the end, particularly useful with multiple drugs and forgetful patients.
(30) A more socially isolated person might become depressed and forgetful, and not be able to cope.
More similar words: fretful, forgive and forget, forget, gorge, tactful, hurtful, forgery, doubtful, boastful, resentful, wistfully, frightful, deceitful, tactfully, gorgeous, disgorge, forget about, forgetting, thoughtful, delightful, at full speed, set forth, set free, set fire to, forgot, organ, for good, forgive, forgotten, sorghum.