abiogenesis 11 Associations

autogenesis autogeny spontaneous generation organic phenomenon (generic term)

ad-lib 6 Associations

spontaneous unwritten unscripted (similar term)

impromptu 9 Associations

ad lib ad libitum spontaneously

impulsive 9 Associations

unprompted spontaneous (similar term) self-generated (similar term)

instinctive 11 Associations

natural spontaneous (similar term) self-generated (similar term)

intuitive 9 Associations

spontaneous (similar term) self-generated (similar term)

miscarriage 11 Associations

spontaneous abortion stillbirth abortion (generic term) live birth (antonym)

natural 7 Associations

instinctive spontaneous (similar term) self-generated (similar term)