opportune C2+

/ˌɑpərˈtun/ well-chosen or timely; suitable for a particular purpose

inopportune C2+

/ɪnˌɑpərˈtun/ occurring at an unsuitable or inconvenient time

opportuneness C2+

/ˌɑpɚˈtunnəs/ the quality of being well-timed or favorable for a purpose