straight
Achievement is an example.
Undersized would be one.
No such word as "errational". If you meant "irrational" then a synonym would be 'unhinged', 'mad', 'loopy', 'impulsive', 'unreasonable', 'unsound'.
plentiful
enlarge
The closest synonym to the word visible would be 'in view'.
The closest synonym for equipped would be armed.
I think "recommended" would be the closest.
the correct synonym for the word maintaining is Preserving.
impending
stop
challenging
guaranteed
Particulars
Significant.
Foresee
discusted