be under the impression be under the influence be under the same be under the supervision be under threat be under water be under way be undercover be undergoing be underground be underlined be undermined be underneath be underpinned be underrated be underrepresented be underscored be understandable be understanding be understated be understood be understood as follows be understood in terms be understood to mean be undertaken be undertaking be undervalued be underwater be underway be underweight be undesirable be undetectable be undetected be undisturbed be undone be undressed be unduly be unearthed be uneasy be unemployed be unequal be unequivocal be unequivocally be unethical be uneven be unevenly be unexpected be unexpectedly be unfair be unfairly be unfaithful be unfamiliar be unfavorable be unfeasible be unfinished be unfit be unfolded be unforeseen be unforgettable be unforgiving be unfortunate be unfounded be unfriendly be ungrateful be unhappy be unhappy about be unharmed be unhealthy be unheard be unhelpful be unidirectional be unified be uniform be unilateral be unilaterally be unimportant be uninhabitable be uninstalled be unintentionally be uninterrupted be union be unique be uniquely be uniquely identified be unit be united be unity be universal be universally be university be unjust be unjustified be unkind be unknown be unlawful be unlearned be unleashed be unlikely be unlimited