The Oxford Thesaurus An A-Z Dictionary of Synonyms INTRO ...

level adj. 1 even, smooth, plane, uniform, plain, flat, flush,
straight, true: The plaster is not level enough to apply the
wallpaper. 2 horizontal; prone, supine: Make sure the playing
field is level. Try to keep the body level when doing this
exercise. 3 uniform, constant, steady, consistent, invariable,
unvarying, unalterable, unchanging, unfluctuating; very: I did
my level best to warn him, but he wouldn't listen. 4 parallel,
even, equal, equivalent, consistent: The top floor of my house
is level with the roof of the one across the street. The problem
arises because wages are not level with inflation. 5 up (on),
informed (about or on), up to date (on or with), au fait (with),
au courant (with): He does his best to keep level with what is
going on in the world. 6 even, tied, equal, neck and neck: The
scores are level. So at half-time, it's level pegging between
Arsenal and Liverpool. 7 See level-headed, below.
--v. 8 level off, even, smooth (out), flatten (out): The
concrete is levelled by dragging a straight-edge over it. 9
destroy, demolish, raze, lay waste, devastate, knock down, tear
down, pull down, wreck, bulldoze: The building was levelled in
a matter of minutes. 10 aim, point, draw a bead, direct, train,
focus: He levelled his gun at her and she screamed. 11 level
with. be or play fair with, be honest or straight with, be open
or frank or straightforward with, Colloq be upfront with: I am
going to level with you - I find you very difficult to work
with.
--n. 12 plane, horizontal, elevation, height; altitude: The
windows are at the same level. 13 floor, storey: On which
level is Mr Stone's office? 14 plane, position, status,
standing, rank, stage: She functions at a higher level, both
administratively and intellectually. 15 on the level. straight,
straightforward, honest, direct, sincere, square, open,
above-board, Colloq upfront, on the up and up, US
straight-shooting: You haven't been on the level with me about
your plans for the company.
level-headed
adj. (well-)balanced, sensible, sane, reasonable,
commonsensical, level, unruffled, undisturbed, unperturbed,
imperturbable, even-tempered, composed, calm, cool, collected,
tranquil, serene, unflappable, poised, relaxed, self-possessed:
Even when she was a teenager, Fran was quite level-headed.