adj. (colloquial).Imaginative; whimsical; sentimental. Also NOTIONATE.
16912. Gentlemens Journal, 5 March. The lady tipd (perhaps) out of her NOTIONAL love, was downright bent for a more substantial one.
1728. BAILEY, English Dictionary, s.v.
1881. W. D. HOWELLS, Dr. Breens Practice, ix. She s been a little NOTIONAL, she s had her head addled by womens talk, and she s in a queer freak.