WordNet sense 1 (a heterosexual person; someone having a sexual orientation to persons of the opposite sex):

heterosexual person, straight person

WordNet sense 2 (a straight segment of a roadway or racecourse):

straightaway

WordNet sense 3 (marked by good order and cleanliness in appearance or habits):

tidy

WordNet sense 4 (without concealment or deception; honest):

straightforward

WordNet sense 5 (characterized by honesty and fairness):

square

WordNet sense 6 (no longer coiled):

uncoiled

WordNet sense 7 (not bent):

unbent

WordNet sense 8 (erect in posture):

unbowed

WordNet sense 9 (upright in position or posture):

erect, upright, vertical

WordNet sense 10 (sexually attracted to members of the opposite sex):

heterosexual

WordNet sense 11 (accurately fitted; level):

true

WordNet sense 12 (being level or straight or regular and without variation as e.g. in shape or texture; or being in the same plane or at the same height as something else (i.e. even with)):

even

WordNet sense 13 (extended senses; direct in means or manner or behavior or language or action):

direct

WordNet sense 14 (without water):

neat, full-strength

WordNet sense 15 (not diluted):

undiluted

WordNet sense 16 (free from error; especially conforming to fact or truth):

correct, right

WordNet sense 17 (successive (without a break)):

consecutive

WordNet sense 18 (continuing in time or space without interruption):

continuous

WordNet sense 19 (in a forthright manner; candidly or frankly):

directly, flat

WordNet sense 20 (conforming exactly or almost exactly to fact or to a standard or performing with total accuracy):

accurate