onerous /onˈə-rəs or ōˈnə-rəs/

1. Burdensome
2. Oppressive

onˈerously adverb

onˈerousness noun

• unformal
• unformalised
• unformalized
• unformatted
• unformed
• unformidable
• unforming
• unforms
• unformulated
• unforsaken
• unforthcoming
• unfortified
• unfortunate
• unfortunately
• unfortunateness
• unfortunatenesses
• unfortunates
• unfortune
• unfortuned
• unfortunes
• unfossiliferous
• unfossilised
• unfossilized
• unfostered
• unfought