very cowardly
очень трусливый (ochen' truslivyy)
"He’s too yellow-bellied to stand up for himself."
"Он слишком труслив, чтобы постоять за себя." (On slishkom zhelto-zheludochny, chtoby postoyat' za sebya)
to change the rules or conditions to make success harder
A true friend is invaluable and precious.
having a very bad memory
to send too many messages or unnecessary information
very tough and determined
a strong desire to travel or move around