The synonym of designated is specific
the synonym for wedge is xhahdghasdgah
The synonym of optimize is perfect.
Level is a palindrome that is a synonym for horizontal
a synonym for similar is alike.
A synonym of difficult is arduous.
difficult
difficult
A synonym for extremely difficult question can be exceptionally tricky problem requiring an answer.
painful
difficult, strenuous,
light, rough, difficult , lifted
difficult, hard, laborious, tough
Hard is a synonym for tall when tall means difficult or not easy. For example, that is a hard (i.e., tall or difficult) order to follow.
yes it is, need proof look on this link... http://thesaurus.reference.com/browse/difficult
a synonym for rare is scarce; difficult to find; not plentiful
Difficult, arduous, burdensome, troublesome, strenuous, demanding, exacting...