1. An auxiliary verb (such as 'can' or 'will') that is used to express modality
   - modal auxiliary, modal verb, modal

Derived forms: modal auxiliary verbs

Type of: auxiliary verb

Encyclopedia: Modal auxiliary verb

• unsuccessful person
• unsuccessfully
• unsufferable
• unsugared
• unsuitability
• unsuitable
• unsuitableness
• unsuitably
• unsuited
• unsullied
• unsung
• unsupervised
• unsupportable
• unsupported
• unsupportive
• unsuppressed
• unsure
• unsurmountable
• unsurpassable
• unsurpassed
• unsurprised
• unsurprising
• unsusceptibility
• unsusceptible
• unsuspected