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Unperturbed
- free from emotional agitation or nervous tension; "the waiters were unflurried and good natured"; "with contented mind and unruffled spirit"- Anthony Trollope
Unstrung
- emotionally upset; "the incident left him unstrung and incapable of rational effort"
- remove the strings from; "unstring my guitar"
Understandable
- capable of being apprehended or understood
Uncomprehensible
- difficult to understand; "the most incomprehensible thing about the universe is that it is comprehensible"- A. Einstein
Unfathomable
- impossible to come to understand
- resembling an abyss in depth; so deep as to be unmeasurable; "the abyssal depths of the ocean"
- of depth; not capable of being sounded or measured
Unintelligible
- not clearly understood or expressed
- poorly articulated or enunciated, or drowned by noise; "unintelligible speech"
Urn-Shaped
- having a concave shape like an urn
Umbellate
- resembling an umbel in form
- bearing or consisting of or resembling umbels
Umbel-Like
- resembling an umbel in form