13-letter words containing f, i, d, u
- unfeignedness — the quality or state of being unfeigned
- unforeskinned — circumcised
- unindemnified — to compensate for damage or loss sustained, expense incurred, etc.
- unpersonified — to attribute human nature or character to (an inanimate object or an abstraction), as in speech or writing.
- unqualifiedly — not qualified; not fit; lacking requisite qualifications: unqualified for the job.
- unrefined oil — oil that hasn't been refined or processed
- unthriftyhead — thriftlessness
- user-friendly — easy to use, operate, understand, etc.: the most user-friendly personal computer now on the market.
- wolffian duct — a duct, draining the mesonephros of the embryo, that becomes the vas deferens in males and vestigial in females.
- working fluid — a liquid or gaseous working substance.