Opportune

1. Suitable for some particular purpose.
2. At a convenient or advantageous time.

Synonyms

• (suitable): appropriate, proper; suitable
• (convenient time): seasonable, timesome; timely

Antonyms

• (all): inopportune
• (suitable): inappropriate, improper; Thesaurus:unsuitable
• (convenient time): unseasonable, untime; untimely