not infrequently (adverb) frequently: commonly, repeatedly
Sinonime: axle, bail, balk,
bolster,
boom,
brace, cantilever, column, crossbar, crosspiece, girder, jamb, joist, lath, lintel,
pile, piling,
pillar, plank, pole,
post, prop, rafter,
reach, scaffolding, scantling,
shaft, sill, spar, stanchion,
stay, stringer,
strip,
strut,
stud, timber, transverse, trestle, two-by-four
Antonime: infrequently, not much,
rarely,
seldom, uncommonly